Farming Systems for Sustainable Intensification

Farming Systems for Sustainable Intensification

Chapter 4 Farming Systems for Sustainable Intensification Sieglinde Snapp and Barry Pound INTRODUCTION Future food security is a challenging proposi...

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Chapter 4

Farming Systems for Sustainable Intensification Sieglinde Snapp and Barry Pound

INTRODUCTION Future food security is a challenging proposition in the face of rising food demand, a degraded resource base, and a changing climate. The situation is already acute, with over a billion people suffering from malnutrition and severe nutritional deficiencies (Godfray et al., 2010) (Partly this is a food distribution problem and a food access problem as much as an under-production problem as explained later in this chapter). Understanding the trajectory of farming systems, including productive capacity and adoption factors, is key to the long-term ability of agriculture to meet future food needs. Sustainable intensification (SI) is an approach that has risen to the top of the agenda, following the definition by Pretty et al. (2011) that SI is a strategy to “produce more output from the same area of land while reducing the negative environmental impacts and at the same time increasing contributions to natural capital and the flow of environmental services.” SI focus is on locally appropriate agricultural technologies that meet both present and future needs (Pretty, 1997). SI is clearly one of humanities “Grand Challenges,” and an essential project in the coming decades. The principles included in the definition of SI are as applicable to high-input agriculture as they are to smallholder farmers in the developing world. In this chapter our focus is on the latter. The rapid increase achieved in Asia of food production in the 1960s and 1970s is referred to as the “Green Revolution.” This was achieved essentially on the same agricultural land with modest expansion. This is evidence that agricultural production can be increased at least in line with population

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growth, at least in Asia under conditions where irrigation and market infrastructure support high production (Tilman et al., 2011). There are major questions, however, regarding environmental costs. There are also concerns about equity; who gains and who loses as production systems are intensified? Coupled with increases in agricultural production have been (in some locations) salinization of productive land, depletion of aquifers, pesticide effects on health, nitrate pollution, loss of biodiversity, further dependence on fossil fuels, the depletion of rock phosphate reserves (, and a rise in greenhouse gas (GHG) emissions. Issues have been raised regarding access to food, food security at different scales, equity in control over production, and achieving nutritional security along with environmental security (Loos et al., 2014). These indeed are integral to SI which includes human dimensions as well as environmental and economic considerations. We explore here definitions of SI, what it involves, the evolution of pathways of farming system transformations, and possible ways forward. To understand SI, an overview of key drivers and consideration of historical trajectories of agricultural change is useful. Ester Boserup is a pioneering thinker on agricultural intensification and land use change processes across Africa and Asia. Population density is the driver of change that she first considered 50 years ago—based on a synthesis of worldwide literature on tropical agricultural systems (Boserup, 1965). As population density increases, she noted that community mobility decreases and villages tend to become static and develop permanent fields. Short-term fallows often replace shifting cultivation and pastoralism, and may in turn be replaced by continuous cropping (Table 4.1). Communal lands that are primarily natural forest or grasslands, and used for hunting, grazing, and foraging, come under pressure, and may be replaced by crop production. Human population densities, through migration and/or in situ growth, may come to put such pressure on land use that its quality declines. As soils degrade, and out-migration becomes common, investment in agricultural production intensifies. This generally leads to more frequent cropping and controlled forms of livestock management, as shown in Table 4.1. The role of population density is important, but today we know that other factors require consideration as well. These include the environmental context, the size, accessibility, and type of markets, the availability of capital and labor, historical traditions and culture, political stability, technological innovations, and political edict (Jayne et al., 2014). Not all of these factors are static. The dynamic nature of market linkages will be considered here, as a driver of innovation and change in farming systems. Another dynamic factor is environment, and Chapter 13, Climate Change and Agricultural Systems, considers in some detail how climate change is influencing agriculture, and adaptation responses to this including intensification.

TABLE 4.1 The Relationship of Population Density to Intensification in Agricultural Production Systems Population Density Very sparse (,4/ km2)


Sparse (4 16/km )

Medium (16 64/km2)

Dense (64 250/km2)

Very dense (. 250/km2)

Crop Intensification Natural area fallow (forest or grassland) Foraging or occasional cultivation

Bush fallow of 5- to 20-year intervals between periods of crop cultivation

Short fallow of 1 5 years with frequent crop cultivation

1. Continuous cultivation, annual crops (seeds of improved varieties) 2. Extensification, with conversion of more land to agriculture, is common

1. Continuous multicropping of diverse food crops, input use (seeds, other inputs) 2. Continuous sole crops with high inputs and mechanizationb

Livestock Intensification Natural area fallow and free roaming livestock Transhumance in some casesa a

Bush fallow with common land for grazing livestock Transhumance

Constrained common lands for grazing

Dedicated pasture areas for livestock, some investment in pasture (seeds)

Confined feeding livestock using “cut and carry” and improved pastures (seeds, other inputs)

Livestock moved around with availability of grazing land. An alternate pathway to intensification, one that has been pursed in rice 2 rice and rice 2 wheat systems, as well as many maize-based production systems. Source: Adapted from Boserup, E., 1970. Woman’s Role in Economic Development. London: Allen and Unwin (Boserup, 1970).



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As we consider intensification, it is important to consider that both sustainable and unsustainable versions of this process are underway. Extensification and expansion of cropped land area is pursued to a varying extent across much of Africa. It remains attractive in situations where maximizing production per unit labor cost is the main driver. It is important to be aware that it is still under way in many nations, as shown by changes in agricultural production area over time. The larger areas farmed in this way keep overall production up to an acceptable level.

THE WHAT AND WHY OF SUSTAINABLE INTENSIFICATION The world is becoming more populous, and incomes are rising along with the demand for food, while arable land suitable for production and water supplies are essentially finite. Land that can be utilized for cropping without massive investment varies across Africa, with recent estimates ranging from 15% in Malawi to 60% in neighboring Zambia (Jayne et al., 2014). These drivers bring SI to the fore. We need to use arable, grazing, and forestry land (as well as aquatic environments) more efficiently to provide for the needs of the present and the future. Production needs to increase between 60% and 110% between now and 2050 according to many projections in order to satisfy the demands of a larger, more urban population, and growing demand for animal products (Hertel, 2011). Agricultural production could be increased by mining soils of their fertility, depleting fossil water reserves, and converting rainforest to arable land, but only for the short-term, and only by compromising the environment. According to FAO figures, world agricultural production almost tripled between 1961 and 2013, while population grew from 3 to 6.8 billion. Urbanization and income gains have driven an even faster rise in the demand for animal products, with concomitant pressures on farming system production (calories produced and directly consumed as grain are up to sixfold more energy efficient than through indirect grain consumption via livestock production (van Zanten et al., 2015), although some land used for livestock is not suitable for arable production). Over the last decade, world cereal production has risen by about 2% per annum ( The green revolution drove production growth with new germplasm, inputs, water management, and rural infrastructure. Undeniably dramatic gains in crop yields have been achieved, notably a threefold increase in wheat and rice productivity in some regions. Further attention is urgently needed to protect future global capacity to produce food, fuel, fiber, hides and skins, beverages, timber, and medicines from agricultural and natural habitats. These are provisioning services that are vital to mankind’s future wellbeing. However, conversion of natural areas such as forests and wetlands has led to tremendous loss of biodiversity, including species extinction and loss of habitat (Garnett et al., 2013). Environmental services such as flood

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control, water quality, and air quality are other vital functions that have been diminished in the face of agricultural expansion, while the conversion of forest to arable use contributes to global warming. SI has been defined as a form of production wherein: “yields are increased without adverse environmental impact and without the cultivation of more land” ( Elsewhere it is said to “increase production from existing farmland while minimising pressure on the environment” ( sustainable-intensification). Both definitions stress the need to produce more from existing farmland, in recognition that there are few parts of the world where arable cropping can be significantly expanded without severe negative consequences. A third definition of SI is a system in which “inputs and capital provide net gains in productivity, but also protect land and water, and enhance soil fertility over time” (Reardon et al., 1995). The reference in all three definitions to the environment emphasizes that the long-term stability of agricultural systems is underpinned by its natural resource base. However, the evidence suggests that this resource base is being depleted in ways that threaten production in the long-term. The world loses 12 million hectares of agricultural land each year to land degradation, and inefficient pre- and postharvest practices make agriculture the largest source of GHG pollution on the planet (see http://www.cgiar. org/consortium-news/world-scientists-define-united-approach-to-tacklingfood-insecurity/ from 2012). Most definitions of SI focus on, or infer, an emphasis on food production, and particularly crop production. However, other types of farm products (e.g., meat, milk, eggs, beverage crops, skins and hides, fibers, medicines, dyes, timber, construction poles, and biofuels) also contribute to livelihoods and the rural economy, as well as (directly and/or indirectly) to food security. Many farming families have complex livelihood strategies and links to rural as well as urban networks along kinship, friendship, and value chain lines (see chapter: Farming-Related Livelihoods). Families often resort to off-farm and nonfarm activities (laboring, house construction, weaving, tailoring and basket making, brewing, processing, and petty trading, etc.) to supplement on-farm production as—even with intensification—the small area of productive land available to many families is not enough to maintain an adequate livelihood. Such supplementary activities enable a larger population to occupy the land than if they relied on farming alone. In the future, farmers may also be paid for environmental services, such as soil C-sequestration, protection of water quality, biodiversity conservation, amenity access, and practices that minimize GHG emissions. Intensification can be defined in terms of resource use efficiency (output per unit of land, water, labor, or capital), but sustainable intensification must include environmental, social, political, and economic aspects (see Table 4.2).

TABLE 4.2 Aspects of Sustainability Required to Ensure That Future Generations Are Able to Maintain Intensified Production Intensification

Increased production per unit of land, water, labor, or capital


Sustainability Components Environmental




Biodiversity conservation

Stabilization of local and global populations

Adequate economic return to capital and labor Appropriate input supply and market prices

Fair and secure land tenure, ownership, and distribution

Maintenance of ecosystem services (provisioning, regulatory and cultural)a

Maintenance of social cohesion and improvements in social and gender equality

Adequate cash flow to meet family needs throughout the year

Ensuring personal security for families and communities Support for wellfunctioning community organizations

No increase in GHG emissions

Respect for food sovereignty and intellectual property rights

Ability to achieve livelihood aspirations

Policies encouraging local and global food security

Protection of landscape amenity access and value

Maintenance of cultural identity

Economic safety nets, such as savings and credit groups, and insurance against production and market failure

Investment in good quality support services (research, extension education, regulation, market and weather information, etc.)

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Indeed, SI cannot be considered in isolation, and a recent review by IIED (Cook et al., 2015) positioned SI within local and global food systems that include not only food production, but also food processing, marketing, distribution, food access (availability and affordability), and food sovereignty. (“Food sovereignty is the right of peoples to healthy and culturally appropriate food produced through ecologically sound and sustainable methods, and their right to define their own food and agriculture systems. It puts those who produce, distribute and consume food at the heart of food systems and policies rather than the demands of markets and corporations.” http://www. Garnett et al. (2013) consider SI from the whole food system view, to take into account the demand for resource-intensive foods such as meat and dairy products that use productive land inefficiently. They point out that reducing food waste and developing governance systems that improve the efficiency and resilience of the food system are important to improving global food security. They go further by adding a social equality dimension—that food should be accessible to, and affordable by, all. This is consistent with the view of SI put forward by Loos and colleagues (2014). However, this is contested, and narrower, production-focused definitions of SI are still widely held, particularly by agronomists and crop scientists (Petersen and Snapp, 2015; Tilman et al., 2011). SI tends to look at the supply side, but there is a need to also understand the demand side, and ensure that there is compatibility between the two. For instance the rise in urbanization and of the “middle class” in emergent and developing countries means an increasing demand for meat and milk products. While some land is well suited to livestock production, many argue that the use of potential arable cropland for the production of fodder or livestock feed is inefficient and unsustainable. While there is evidence that sunlight, soil, and water resources can be used most efficiently to produce food crops that feed people directly, the farmer has to decide which system and which products give him or her the best financial return to labor and capital, as well as to land. Such decisions can be influenced by governments through guaranteed markets, subsidies, and tax breaks on the supply side, as well as education and taxation that influence the demand side. Table 4.3 shows that different stakeholders each have a unique perspective of the functions of SI. This table is not comprehensive, but serves to show how different the priorities can be. It illustrates that while some stakeholders (farmers, urban consumers, and the private sector) are looking for private goods (mainly agricultural products that they can use to feed themselves or make a profit), others (international organizations, government, and NGOs) are also looking to farming systems for provisioning of public goods (ecosystem goods and services for the benefit of the wider society). This

TABLE 4.3 What Different Stakeholders Want From Sustainable Intensification International Bodies



Private Sector


Urban Consumers

Contribution of food security to world peace

Food security leading to political stability

Environmental sustainability

Sale of inputs and services (profit)

Food security for family

Reliable supply of cheap food of good quality

Safeguarding of global goods (climate change, conservation of biodiversity)

Import substitution and export potential by locallyproduced crops, livestock, and trees contributing to the national economy

Social justice

Reliable supply of good quality products for processing and retailing

Net income (revenues minus costs), including payment for safeguarding the environment Justice

Supply that reflects changes in demand (e.g., increasing livestock products)

Contribution to Millennium Goals and post-2015 sustainable development goalsa

Tax revenues

Food sovereignty

Carbon trading opportunities

Reduced risk and vulnerability

Respect for global treaties (e.g., environmental protection and GHG emissions)

National public goods (clean water, environmental buffering, access to and amenity use of land, cultural heritage)

Equity (ethnic, wealth, and gender)


Access to good advice and reliable inputs for sustainable land productivity, with a range of production options

United Nations (2014). The Road to Dignity by 2030: Ending Poverty, Transforming All Lives and Protecting the Planet. Synthesis Report of the Secretary-General on the Post2015 Agenda. UN—particularly Sustainable Development Goals 2 and 15: Goal 2: End hunger, achieve food security and improved nutrition and promote sustainable agriculture; Goal 15: Protect, restore and promote sustainable use of terrestrial ecosystems, sustainably manage forests, combat desertification, and halt and reverse land degradation and halt biodiversity loss.

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raises the question whether farmers should receive payment for providing these public goods, and if so how they can be remunerated. This is touched on in the “Way Forward” section of this chapter.

ALTERNATIVES TO INTENSIFICATION Before exploring the merits and processes of SI, we should consider briefly if there are alternatives to SI. Some will argue that there are land uses that are more pressing or important than food production, including urbanization, amenity use, and conservation of wild species in national parks. Some land is unsuitable for SI, and is better used for extensive agriculture such as wildlife ranching or pastoralism. In many countries farming is a low prestige occupation that provides modest returns, such that the youth are more interested in nonfarm occupations, and often move off the land altogether. By contrast, some initiatives are trying to raise the standing of agriculture by creating a cadre of professional farmers who understand “farming as a business,” and the principles behind good husbandry, the use of information, and value chain management. Novel food production systems such as hydroponics, or new food products such as those based on microalgae or the conversion of food waste by insects (see have yet to make a significant contribution to global food production, but could become important in the future if food prices rise and supply lags behind demand. Education (especially of women and girls) and population interventions (family planning, tax incentives, and the one child policy in China) seek to balance the equation involving people and food by reducing demand, rather than by increasing supply. Both will need to be applied if the world is to be fed adequately and equitably in the years to come. Garnett and Godfray (2012) make the case that SI is required whether or not there is need for more food, because it is necessary to increase productivity per unit of resource in order to conserve resources. They see SI as one of several components of a sustainable food system, and feel that family planning, the reduction of food losses and waste, improved governance, and demand management should be implemented alongside SI (Fig. 4.1).

SUCCESSFUL SUSTAINABLE SYSTEMS SI as an explicit concept is relatively recent (Petersen and Snapp, 2015). However, many successful civilizations have depended on long-lasting, intensive farming systems. Diverse examples of systems that have lasted for hundreds or, in some cases, thousands of years include the remarkable terrace systems in the Philippines (, the Aztec field systems (Chinampas) in Peru (, the irrigated land served by the Ma’rib dam in Yemen (http://, and the horticultural food production


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FIGURE 4.1 Sustainable intensification in relation to food demand, waste, governance, and population. Used with permission, Garnett and Godfray (2012).

systems of Paris “fueled” by a million tons per year of horse manure (http:// All of these display technical and organizational brilliance. It is also important to understand that they required substantial resource inputs to build an infrastructure (terraces, field systems, irrigation, heat distribution systems) that augmented the natural environment and reduced the risks of failure. Environmental services such as regulating water through hydraulic design coupled with strategic conservation of forested patches in between terraces has been a key feature of the Ifugao Rice Terraces in the Philippines. There are challenges faced today, including out-migration, and extreme weather events, but the terraces have survived for centuries and embody innovative approaches to a harmonious farming system that is integrated with natural areas (Gu et al., 2012). A relatively recent success story is the restoration of land in Machakos, Kenya, that was so degraded in the 1930s that the then colonial “experts” declared the land useless for agriculture. They were proved wrong by investment by local people in soil and water conservation techniques that have stabilized and improved soils, such that agricultural output has been greatly enhanced. The population density increased fivefold over that when the land was written off some 60 years previously (Tiffen et al., 1994). In this case, the resources to carry out this long-term land restoration came from those working in Nairobi who invested part of their earnings in rehabilitating their home lands.

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In other situations, a failure to look to future consequences has resulted in unsustainable land management practices that have caused civilizations to collapse, such as on Easter Island ( pii/S0341816205000937), or the Great Plains of the United States (http://

WHEN IS SUSTAINABLE INTENSIFICATION RELEVANT? The relevance of SI to any situation requires an understanding of the context in which it is being considered. Each country has a unique history, a specific set of circumstances and resources, and its own vision going forward. For some countries SI is a sensible and necessary strategy in response to extreme pressures on the land, and the need to feed populations from their own resources (e.g., Rwanda and Ethiopia). The vast majority of the world’s farms are small or very small, and in many lower-income countries farm sizes are becoming even smaller as rural populations increase. In low- and lower-middle-income countries 95% of all farms are smaller than 5 ha (FAO, The State of Food and Agriculture, 2014). Below a certain size, a farm may be too small to constitute the main means of support for a family. In this case, agriculture may make an important contribution to a family’s livelihood and food security, but other sources of income through off-farm employment, pensions, or remittances are necessary. These small and medium-sized farms are central to global natural resource management and environmental sustainability, as well as to food security. Many small or medium-sized family farms in the low- and middle-income countries could make a greater contribution to global food security and rural poverty alleviation through SI, depending on their productive potential, access to markets, and their capacity to innovate. The FAO believes that through a supportive agricultural innovation system, these farms could help transform world agriculture (FAO, The State of Food and Agriculture, 2014). Two examples help to illustrate how SI can be relevant in quite different circumstances: Zambia historically has experienced a relatively low population density in rural areas. However, the high population growth rate (3.2% per annum) means a doubling of the population every 26 years, and 50% of the population is under 15 years old. The government is now encouraging smaller families ( 1_Zambia__Poplution_and_National_Development_2010_Marc.pdf). Meanwhile, the rise in the rural population and consequent expansion of land under cultivation has led to deforestation, soil erosion, and land degradation. SI can mitigate some of these pressures by reducing the necessity to expand the cultivated area and by supporting better ecological practices. By contrast, Rwanda is a small country with a high pressure on the land. The public sector family planning program increased the modern contraceptive prevalence rate fourfold in 5 years, significantly reducing the total fertility rate (


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templates/Docs/Rwanda-Family-Planning-Policy.pdf). At the same time, there are agricultural development goals, including the intensification and development of sustainable production systems. While there is a strong intensification direction, the sustainability component is questionable. Indeed, the policy requires land use change from natural swampland to monoculture rice, widespread use of inorganic fertilizer, more livestock (especially cows, which produce methane), and increased mechanization, all of which contribute to increased GHG emissions.

SUSTAINABLE INTENSIFICATION INDICATORS Recent efforts in SI and agricultural development have focused on a better understanding of how to monitor SI over time, and improve understanding of trade-offs among different domains of SI. This approach is being advocated as a means to better detect synergies and conflicts, and minimize unintended negative consequences. Although the use of indicators and metrics of SI is just one aspect of SI research, it can provide a warning if one or other of the domains is out of step with the overall intention, to support a sustainable trajectory of change. Consideration of SI domains and accompanying metrics is also an important means to take into account interactions among domains, and expand the concept of SI through systematic assessment. The domains and indicators suggested by Smith et al., in review, is a good start (Table 4.4), but consideration might also be given to policy and institutional aspects (e.g., research, extension, carbon-credits, and market support). The concluding chapter of this book (see chapter: Tying It All Together: Global, Regional, and Local Integrations) revisits this topic and provides a holistic view, including consideration of policy, cross-sector initiatives, and infrastructure. After Smith et al., in review.

TRADE-OFFS AND SYNERGIES SI from some viewpoints is an impossible goal. How can one get more from the same resources? Something has to give, or something has to be invested in order to balance the equation. We acknowledge that SI will have to accommodate compromises (trade-offs). For example, crop residue utilization for animal feed necessarily means less residues available for fuel and soil cover. At the same time, synergistic interactions among domains also occur, such as improved farmer knowledge, which can support production of high-residue crops that simultaneously address production, economic, and environmental goals. Finally, an important reason to pay attention to SI indicators is that interactions among domains become clear, thus providing a knowledge base upon which conscious, evidence-based choices can be made. Overall, trade-offs are common between short- and long-term production, or between intensification to maximize production and concomitant enhanced

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TABLE 4.4 Sustainable Intensification Indicators and Metrics Domains



Crop and livestock product yields per farm and per season


Total agricultural profits per household No. of households selling agricultural products Poverty headcount

Human wellbeing

Farmer knowledge Family food security Family nutrition


Vegetative cover Biodiversity Soil organic matter


Equity (distribution of productivity, income, and assets) Women’s empowerment

Whole system

Trade-offs and synergies (see below)

generation of GHG emissions (Robertson et al., 2014). The quest for higher yields of commodity crops may see increased use of monocultures, involving a small range of high yielding varieties and a reduction in mixed cultures with diverse minor crops and local landraces (with a consequent loss of biodiversity, culture, and family nutrition). Rwandan agricultural policies promoting consolidated, sole cropping production systems is a case in point (Isaacs et al., in press). The use of chemicals (fertilizers and pesticides) might alter the above- and below-ground fauna and flora, thereby compromising the resilience of the ecosystem. Regulated ecosystem management that optimizes production by growing only what is suited to the environment might restrict individual enterprise choice and innovation. A quest for high productivity might be at the cost of reliability, and incur risks of harvest failure, while the use of external inputs might raise the price of food beyond what can be afforded by some sectors of society. Increased water use for irrigation (and therefore greater reliability and productivity) in one location might mean less water is available for downstream users. Harnessing water for agricultural uses has been frequently shown to have unintended negative consequences for equity, as recent migrants to an area, women, ethnic minorities, and poorer farmers can become marginalized during the process of institutionalizing water rights and irrigation infrastructure development (see chapter: Gender and Agrarian Inequities, for in-depth consideration).


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On the positive side, there are prospects for synergies. Careful inputs of nutrients and supplemental water can transform degraded soils with low organic matter into productive, resilient soil that is easier to cultivate and better buffered against climatic and biotic threats. Carefully integrated crop/ tree/livestock systems can enhance the efficient cycling of nutrients and inter-enterprise benefits, such as shade and shelter for livestock, and draft power for cultivation, weeding, and transport. Intensively cultivated areas and farmer organizations can produce a surplus that can attract services (inputs, credit, infrastructure, research and extension, transport, markets, etc.) and negotiate higher prices, educational services, and equitable returns. Intensification might lead to more community cohesion and improved education, health, and communication services, leading in turn to improved knowledge, skills, capacity, and contacts.

THE ELEMENTS OF SUSTAINABLE INTENSIFICATION We next consider in-depth the main elements required for SI that raise outputs without compromising the environment. There are two important pathways, enhanced efficiency through integration and related investments, and reduction of losses and risk (Fig. 4.2). Aspects of an enabling environment are shown in the figure as well. Note that investment in social and natural capital is key. This includes enhancement of social organization and knowledge, but also the application of ecological principles to agricultural systems to build genetic resources (new crops, livestock), soil resources (soil organic matter, biodiversity), water and nutrient resources, and infrastructure for

FIGURE 4.2 Summary of the elements of sustainable intensification.

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livestock, manure capture and reuse, and markets. The agroecological aspects are a major topic of this book and are explored in some detail in Chapter 2, Agroecology: Principles and Practice, and Chapter 5, Designing for the Long-term: Sustainable Agriculture.

An Enabling Environment To provide over-arching support for SI, an enabling context is required. This includes appropriate research, extension, training, credit, supportive policies, fiscal and legal structures, as well as peace and stability, disaster management, and infrastructure such as roads, transport and communication networks, storage, processing facilities, and markets. This enabling environment will normally be part of a government’s agricultural strategy, which will in turn be part of a national development plan. In an ideal scenario, civil society, nongovernment organizations, donor projects, and the private sector will work in the same direction as the government, providing extra support and fulfilling functions that the government cannot or does not provide. Another aspect of an enabling environment is social cohesion within communities; this provides a common vision and an agreed, long-term, commitment to the concept and activities of SI. This can be facilitated through local and village governance structures, and also through different forms of social organization, including clubs, societies, religious bodies, associations, cooperatives, or innovation platforms providing forums for solidarity and mutual support, and some specialization of roles and responsibilities. These social structures provide an efficient means for sharing information, labor, and materials, for seeking support, and for tracking the progress of SI initiatives.

Reducing Losses Central to SI and environmental goals is improved efficiency, which requires careful attention to reducing losses and conserving resources. All the glory is in scoring goals, but saving them is equally important. Perhaps this underlies the under-appreciated nature of this topic, reducing losses. Farmers’ knowledge of biology and chemistry applied to day-to-day farming choices can enhance effectiveness of pest control and nutrient utilization, for reduced losses. Examples are provided in Box 4.1. The principles involved, that support enhanced water and nutrient recycling, are a central subject of Chapter 5, Designing for the Long-term: Sustainable Agriculture, and Chapter 7, Ecologically Based Nutrient Management. Reducing the loss of water, soil, and nutrients from the farm is an obvious, but difficult, aspect of waste reduction, because soil and water conservation involves investment in labor, materials, and the sacrifice of some land and management flexibility. A single farmer operating in isolation may not be able to control the forces affecting his or her farm, but needs to operate in concert with


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BOX 4.1 Practices That Conserve Resources and Prevent Losses Specific examples of practices that reduce losses to improve system efficiency, include: G Careful husbandry that optimizes the growing season, and applies nutrients and pest (Including parasite and disease control in livestock, as well as inputs in crop production) management chemicals precisely in terms of type, quantity, and timing; G Improving farmer knowledge of the principles behind good husbandry (an example would be a knowledge of the relationship between evaporation, evapo-transpiration, and leaching at different stages of plant growth, so that adjustments can be made by the farmer resulting in greater efficiency of production); G Soil moisture management to increase the output per unit of available water and reduce water losses from the farm (e.g., rainwater harvesting, irrigation, mulches, soil and water conservation, increasing water-use efficiency through deeper rooting and better plant nutrition, planting trees strategically to aid rainwater capture and percolation); G Use of reliable and productive genetic material resistant to pests and diseases, adapted to the environment, and suited to their end use; G Measures to minimize losses from hail, frost, flood, drought, and wind (e.g., planting dates, cold-tolerant varieties, physical and biological flood and wind defenses); G Intercropping, relay cropping, and multistory “gardens” to optimize use of soil, water, and light resources; G Postharvest management to reduce losses due to pests, diseases, and climatic spoilage; G Use of local weather and market forecasts to support decisions on planting, fertilizer, and pesticide application.

neighbors to channel storm water or plant trees to reduce wind speeds, or bind soil on steeply sloping communal land (at the same time capturing moisture through improved percolation). Terraced land management such as is found in Yemen (Fig. 4.3) requires a high degree of community participation, not only in the planning and construction of such works, but over the long-term for maintenance. Physical structures and conservation measures require social structures as well, for equitable distribution of labor, access to land, and dispute resolution. See Table 4.2 “Dimensions of sustainability” for an exploration of the complexity involved, particularly when considering soil and water conservation at the watershed and landscape scale. Some countries in sub-Saharan Africa are starting to use digital technology to greatly refine fertilizer recommendations in terms of the blend of nutrients and the quantity of fertilizer to be applied for specific crops. An example is the Ethiopian Soil Information Service (EthioSIS) launched in

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FIGURE 4.3 Terraces with stone risers in Yemen. These require a large investment of labor in the short-term for a long-term payback.

2012 (Bellete, 2015). A first-of-its-kind national initiative in Africa, the project uses remote sensing satellite technology and extensive soil sampling to provide high-resolution fertility soil mapping for each region. An example for Tigray region is shown in ethiosis/. The recommendations are supported by high-volume fertilizer blending facilities in each region. However, even at the higher resolutions now made possible by digital imagery and automated sample analysis, the highly dissected topography of Tigray means that there is considerable infarm variability in soil fertility (due to rainfall, slope, aspect, cropping history, soil cover, etc.). Therefore the farmer will need to observe and adapt the improved recommendations for different parts of his or her farm. It is also important to keep in mind that nitrogen and phosphorus are the primary drivers of crop productivity worldwide, and augmentation of soil organic matter is essential to support crop response to fertilizer and address the majority of micronutrient imbalances (with rare exceptions due to nutrientpoor soil parent material). See www.msu.learninglabafrica/Nitrogen—It’s what’s for dinner, for the on-going conversation on the rationale behind the focus of Chapter 7, Ecologically Based Nutrient Management, on the management of soil carbon, nitrogen, and phosphorus, as a foundation for sound crop nutrition. This is as relevant for farmers in Ethiopia as elsewhere. Preventing loss includes attention to pre- and postharvest production, and to animal as well as crop system components. Livestock feed is often wasted though trampling, soiling, or rotting through contact with wet ground. Simple, improved feed troughs made with locally available materials can reduce this dramatically, as shown in the example in the photo from Ethiopia (Fig. 4.4).


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FIGURE 4.4 Locally made improved livestock feeding facilities to reduce wastage are a sometimes underappreciated aspect of sustainable intensification; example shown here from Ethiopia.

The loss of nutritional value of fodder through spoilage can also be minimized by simple storage structures that reduce the impact of rain, contact with wet soil, and damage by pests. Attention to the quality of feed through balanced diets, based on locally available residues and forage, are also key to improving efficiency of forage utilization and livestock health. This is illustrated by research for development efforts in Ethiopia that have identified fodder and feed as key interventions for improving production and livelihoods based around small ruminants such as sheep ( Livestock losses to intestinal worms, external parasites, and disease are easier to manage when the stock is adequately housed or zero-grazed. That is, where feed is brought to the animal. The collection of manure and urine for application to crops is facilitated by intensified animal production which enhances nutrient cycling efficiency on a farm. There are controlled grazing approaches to improved crop 2 livestock integration as well as zero-grazing, but all require a step-change initiated through the intensive management of livestock. Forage quality improvement, livestock genetic potential, credit available to invest in stock, facilities and inputs, and good veterinary support are all part of an enabling environment for livestock intensification. Chapter 9, Research on Livestock, Livelihoods, and Innovation, explores livestock innovations and intensification options in more depth. Improved genetic resources for clonal plants also requires close attention to preplant storage and handling, to reduce losses and enhance planting material quality. In the mountains of Ethiopia, seed potatoes are traditionally stored in earth clamps and planted without sprouting (chitting). This results in 50% of the seed rotting in the clamps or in the soil after planting. The

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FIGURE 4.5 Diffused light storage for potatoes in highland Ethiopia to reduce rotting and promote sprouting.

Africa-RISING project ( has introduced diffused light storage facilities that have greatly reduced losses both in storage and after planting, and resulted in higher yields due to the controlled and prolific sprouting of the seed potatoes before planting (Fig. 4.5).

Risk Mitigation Farmers face multiple risks. A single landslide can wipe out the work of a lifetime, while a machete accident can render an able-bodied person unproductive for a season. Insecurity and violence hold back or disrupt development in general, but can decimate an individual farmer’s assets (e.g., through cattle rustling) overnight. Market fluctuations can mean that a well-grown crop has little value in the market place. This is especially devastating for perennial crops with less flexibility from year to year. Schemes such as Fairtrade can offer a safety net “minimum price” for products, including perennial crops such as coffee. The minimum price is set at or above the cost of production so that farmers can at least maintain their coffee bushes until the price recovers ( Farmers are unlikely to adopt new practices if they incur substantial risk. This particularly applies to farming families already in vulnerable situations. It is therefore sensible to consider risk reduction measures together with intensification initiatives. Government or community disaster relief funds can assist those afflicted. Farmers associations can offer moral and material support, and savings and credit groups can help provide seasonal or


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emergency needs for cash and avoid reliance on predatory loans. Improved weather forecasts and market information systems can play their part in reducing risk in decision-making. Insurance against crop failure or livestock death is being considered in some counties. However, access to reliable and timely information about weather remains a major problem for smallholder farmers around the world, and a recent review found this access gap precluded the success of crop insurance schemes with a few exceptions (Tadesse et al., 2015). Other approaches to buffer risk include trustworthy market contracts, secure land tenure, and competent service provision (advice and inputs). These would go a long way toward encouraging longterm investment in farms, and confidence in trying out new technologies. While some of these can be provided by external agencies, and community organizations, farming families are highly experienced at risk mitigation, a major component of rural survival strategy. Spreading the risk of failure through diversification, intercropping, the integration of crops, trees and livestock, and a mix of farming and nonfarming income are important aspects of risk reduction. These are time-tested approaches to enhance the ability of farms to protect against disasters, and bounce back from extreme events. Agricultural development efforts and advisors have in some cases focused on innovations that maximize production under good conditions, with inadvertent consequences such as overexposure to risk. Local traditions and indigenous knowledge are often important sources of technologies and practices that enhance farm resilience and stable production in the face of climatic extremes. An example of paying attention to risk-mitigation while promoting improved livestock and gardening practices is provided by the “Send-A-Cow” nongovernmental organization operating in East and Southern Africa (Fig. 4.6). This holistic approach involves education, and resources for farm infrastructure to reduce risk from livestock loss and drought ( Biodiversity is an important strategy for enhancing system resilience and reducing risk, as described in Chapter 5, Designing for the Long-term: Sustainable Agriculture. In Nepal, some individual farms in the lower midhills have more than 10 different varieties of rice—both for different uses and occasions, but also to use niche planting situations efficiently and to spread risk. In Ethiopia, some farmers plant mixtures of sorghum landraces in the same field—some with open panicles that are difficult for birds to settle on, some with red seed coats that are bitter to pests, and some with closed panicles in case of good rains and successful bird scaring (Fig. 4.7). In many parts of the world, farms are made up of multiple plots that are spread about the landscape to provide a range of environments for different enterprises. This spreads risk and gives all farmers in a community access to some arable land and some grazing land. Chapter 6, Low-Input Technology: An Integrative View, by Rob Tripp provides an in-depth analysis of the challenges associated with many low-input,

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FIGURE 4.6 The NGO Send-a-Cow has introduced risk-reduction technology to Lesotho. The netting roof reduces damage by hail, snow, and heavy rain. The fence reduces livestock intrusion, and the raised “keyhole garden” enables scarce water to be used efficiently for nutritious vegetable production.

FIGURE 4.7 Mixed plantings of sorghum varieties that buffer risk through a diversity of plant traits that prevent damage from weather, bird predation, and fungal disease, while maintaining potential for good yield and nutritious grain.

sustainable production systems that may reduce risks, but also require substantial investments of labor and other resources.

INTEGRATION OF SYSTEM ELEMENTS An important strategy for sustainable intensification is based on the integration of diverse farm enterprises. This can include cultivated


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Total fodder availability


Tree fodder Crop by-products Jan




May June July

Aug Sept




FIGURE 4.8 Integrated fodder production from trees, fodder crops, and grazing.

crops 2 livestock 2 trees, as well as wild fauna and flora. Such diversity will help achieve synergy and raise the overall output of mixed-enterprise farming systems. Thus, livestock can utilize crop by-products, and also provide draft power and manure for crops. Trees can provide shelter, construction materials, and fodder, and recycle nutrients for crop growth (e.g., Faidherbia albida in central Africa), while common property resources can provide a wide range of materials (e.g., fuel, building stone, pollen for bees, bamboo for basket making, indigenous medicines, and bush meat). Understanding the scientific basis for the benefits of integration can help to refine choices, management, and governance of resources, so that they contribute more to raising the productive output of geographically finite systems. Fig. 4.8 shows how the integrated manipulation of a range of fodder sources can provide stable amounts of fodder throughout the year. Similarly, with informed thought and a well-designed combination of enterprises, an integrated choice of farming enterprises can provide food and income throughout the year. In some cases income can be smoothed out by savings, credit schemes, and some off-farm income, while food can be supplemented by purchases paid for by selling what is surplus to family requirements. Most research looks at individual crops or livestock species, with limited study of farming systems as a whole at household or landscape scales. At the household scale, it is instructive to look at whole farm budgets, and to work out biological and financial returns to land, labor, and capital for each enterprise. This can help the farmer make decisions based on facts that complement his or her own experience and gut feelings.

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BOX 4.2 Balancing Nutrient Production in Ethiopian Communities Africa-RISING (a USAID project managed by ILRI) has been investigating cropping systems in Debre Birhan in highland Ethiopia. Barley and wheat are currently the major staple crops. Preliminary results showed that the current production system does not satisfy human nutrition both in quantity and quality of the required nutrients, being especially deficient in calcium, vitamin A, and vitamin C. Preliminary analysis suggests that a shift in the cropping system by reducing the area under barley by about 35%, expanding the land area planted to legumes by 16%, and integrating more vegetables and subtropical fruits could be beneficial to household nutrition. The project plans to use these results in negotiation with the community to facilitate change toward a more food secure landscape. Africa-RISING 2014: Technical report, 1 April 2014 30 September 2014 ( ).

At the landscape level, one can look at the overall amounts of nutrients produced from farming against the population size to see how these compare to recommended levels of carbohydrates, protein, and vitamins (Box 4.2). Where these differ significantly, action can be taken to rebalance the nutrition profile. Garnett et al. (2013) point out that a balanced approach to SI involves attention to diversified output of food that meets nutritional family needs for calories, protein, and micronutirents (vitamins, essential amino acids, and other important nutritional components). In contrast, the focus of some agricultural development schemes involve a few high-yielding varieties of staple foods that have an unbalanced nutritional make-up, and a fragile genetic base. In Rwanda, e.g., mixed cropping has for centuries supported diverse diets and helped meet cultural and spiritual needs. In 2009 this included the production of seven to twenty crop species per farm family, with an average of four tuber species, five legumes, four cereals, cucurbits, and two perennials, all grown in mosaics and relay intercrops (Isaacs et al., in press). However, a land consolidation policy in recent years has drastically reduced the number and types of species grown as each region in Rwanda is encouraged to specialize in a few crops, grown as monocultures. This rapid change in farming systems has been brought about by persuasion, policies, and subsidies, as well as coercion through fines, and violence on occasions. Civil society in the form of NGOs and farmer associations have raised questions about the wisdom of suppressing diversified production systems, particularly in terms of negative consequences for family nutrition, given the imperfect functioning of local markets and income constraints. In order to achieve sustainable intensification, present levels of natural resources (farmed and wild fauna and flora, soil properties, water) need to be maintained, or even improved (Box 4.3).


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BOX 4.3 Precision, Integrated Soil Water, and Nutrient Rehabilitation in West Africa Farm rehabilitation initiated through reclaiming degraded soils has been achieved successfully across substantial areas in West Africa. In the drier regions of Burkina Faso, e.g., water harvesting technologies have been invested in, with farmers planting basins (zai holes) and bunds. These improved planting basins are targeted for precision application of crop residues, organic manure, in some cases microfertilization and improved seeds. This has rehabilitated degraded soils through the judicious targeting of nutrients and water to enhance plant growth, and lead to a virtuous cycle of increased organic materials being produced and recycled, as well as doubling and tripling of crop yields (Lotte et al., 2015). The zai hole technology requires considerable investment in labor to dig planting basins and apply nutrient-enriched materials; it has been sustainably adopted in drier regions (less than 800 mm rainfall), and where degraded soils are available for reclamation. Such soils involve issues such as crusting and nutrient depletion, and can be successfully reclaimed through the integrated approach of improved planting basins. There is a social component as well: women and other marginalized groups of farmers have in many cases been among those most willing to make the investment to reclaim land to expand their agricultural enterprises. In Niger, e.g., women’s groups planted vegetables and fruit trees in Zai holes that allowed abandoned land to be reclaimed for their use. The returns to soil rehabilitation and the value of crops grown must be considered carefully for successful adoption of high labor requiring technologies (see chapter: Low-Input Technology: An Integrative View).

SI involves consideration of “private” services and goods, such as the soil rehabilitation example described in Box 4.3, but these often contribute to “public” conservation and output of agriculture as well. Farmers’ individual choices and rural communities play key roles in producing both food and environmental services that society has an important interest in promoting (see Such environmental or nature’s services include clean water and water regulation, clean air, biodiversity, and the reduction of GHG emissions. These deliver mainly public goods rather than private goods, so much of the investment should come from national or international sources. How to operationalize and initiate policies that enhance returns to support conservation investments by scattered smallholder farmers is a major challenge facing societies today, to ensure a sustainable future.

PATHWAYS TO SUSTAINABLE INTENSIFICATION SI occurs within a dynamic situation, with changing markets and environment that require constant experimentation and adaptation by farmer-innovators,

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FIGURE 4.9 A schematic of how progressive intensification can involve both incremental and radical changes, while maintaining natural resource levels.

and by private and public bodies of both technological and organizational structures. Improvements can be evolutionary (incremental improvements of existing technologies—such as the adoption of new varieties or parasite control in livestock), or revolutionary (new ideas and directions that can radically alter the status quo), producing a “step-change” in productive potential (Fig. 4.9). Such revolutionary changes can mean radical changes to the farming system, and require the learning of new skills, major capital or labor investments, and social reorganization. In some cases the capital investment can be found within the community, an example being the transformative changes described by Tiffen and others in Machakos, Kenya, where remittances financed soil and water conservation, and the adoption of high-value fruit and vegetable production on previously degraded land (Tiffen et al., 1994). An example of social and technical inputs transforming agricultural systems is the adoption of minimum tillage in Brazil that was enabled by the establishment of Clubes Amigos da Terra (“Friends of the Land” clubs), the development of appropriate machinery, and the availability of effective herbicides (FAO, 2001). In some cases a crisis is needed before a step-change is acceptable to the majority in the community, by which time some natural resource may be irreversibly lost. The impetus for a change from extensive to restricted grazing might come from several factors (internal and/or exogenous) working together (e.g., erosion resulting from grazing of fragile areas, conflicts between crops


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and livestock, and a new road opening a market for milk products) to bring about the change from extensive (unregulated) grazing of livestock to one which is regulated (perhaps by “social fencing” as in India ( fileadmin/downloads/forum/docprog/Termpapers/2009_1_Girma_Manh.pdf)), and eventually to a situation where all livestock is zero-grazed or stall-fed. Such a step change often requires agreement and cohesion among the whole community, and discipline enforced by village leaders. Once applied, a range of new cropping options become available and the planting of trees for soil and water conservation, amenity, food, and animal feed becomes viable. Manure and urine capture are more efficient, providing the potential for more efficient cycling of nutrients. Farming families then have to decide on a new balance of livestock and cropping enterprises to suit their labor availability, household needs, and market opportunities. This step change is normally followed by a period of adjustment and gradual improvement. All of these examples bring in a range of new opportunities and challenges, technical, organizational, and social. In many cases those with resources are better able to take advantage of a new opportunity, further exacerbating the gap between poorer and better-off farmers, unless particular support is given to the resource-poor farmers. As shown in Fig. 4.10, different approaches to supporting SI pathways may be appropriate depending on the resources and education of the farmers involved. Farmers with access to markets and the ability to invest may benefit from integrated value chain approaches to agricultural development, where crops are grown as commodities (see the maize 2 soybean rotation trajectory in Fig. 4.10). Ensuring a sustainable mode of intensification primarily involves promoting

FIGURE 4.10 Alternative pathways to Sustainable Intensification for differently endowed households, where well-off households can be supported through market access, whereas poorly resourced households require considerable investment, in education, food crop processing and nutrition, as well as resource rehabilitation.

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agroecological practices and conserving natural resources. Other farmers are much less resource endowed, with poor education, remote locations and often, degraded lands. Outreach to this group requires considerable attention to education, on production and postharvest, from agronomy to family nutrition (Fig. 4.10). As described in Chapter 12, Outreach to Support Rural Innovation, there are many extension modes by which farmers can be supported to develop alternative SI approaches. As shown in Box 4.4, Africa RISING is an example of how participatory action research can engage with farmers across a wide spectrum of resource-endowment, and provide options to help catalyze a range of SI trajectories. Some locations and situations can provide SI gains in the short-term. These are the “low-hanging fruit” for SI, and include fertile soils in accessible locations that have been underexploited to date. These situations can provide long-term productivity increases through modest levels of external inputs and good husbandry methods. However, such places are becoming scarce, and in the near future SI will require greater investment for the same net gains in productivity. Marginal and degraded areas are where many smallholder farmers are situated, and most such locations require investment in soil resource rehabilitation before it is possible to intensify agriculture in even a small way. There is a danger that governments will regard some locations as being underutilized and an opportunity for intensification, when they are in fact vital components of the coping strategies of the poor and marginalized. For example, many irrigation projects involve development of land and water

BOX 4.4 Africa-RISING: An Example of Support for Sustainable Intensification Pathways Underway in the Central Malawi Districts of Dedza and Ntcheu Since 2012, over 1500 farmers, dozens of extension educators, and an interdisciplinary team of researchers have collaborated as part of “Africa-RISING.” This multicountry project is supported by USAID to conduct farmer participatory research on SI. Crop diversification, livestock, and the introduction of multipurpose, leguminous perennials are at the foundation of more integrated, environmentally, and economically sound production practices. Technologies include soybean intensification with improved varieties and rhizobium, in rotation with hybrid maize and recipes for soybean utilization. For farmers with degraded soils, we are investigating the ability of a doubled-up legume system with pigeon pea to improve soil properties and crop response to inputs. This is being tested out with farmers in a participatory mother and baby trial design, combined with education on agronomy, food processing, and family nutrition to support capacity building, soil resource rehabilitation, and enhanced sustainable production. See Fig. 4.10 to show these two pathways to SI for different farmer resource groups.


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resources that are traditionally managed, common-property resources that sustain or supplement land-poor or landless families with food, saleable products, and fuel. Such areas often have an important ecological role as well, such as wetlands that are important to regeneration of water quality. Other examples are grazing areas that provide vital livestock food in drought years, and swampy areas that play an important hydrological role in controlling floods.

THE WAY FORWARD To intensify production sustainably with attention to the environmental, human, and social domains requires farmers and other landowners to take on dual roles—producing food and safeguarding environmental services (http://www. This dual role is sometimes recognized, and farmers are encouraged through mechanisms such as government payments (e.g., in the European Union through the Basic Payment Scheme) to farm in an environmentally friendly way (https://www. media/resources/greening_booklet_for_online_-__february_2015B1.pdf). Indeed, Garnett et al. (2013) see an urgent need for mechanisms that compensate farmers for meeting SI objectives, such as climate change mitigation or biodiversity protection, where this involves actions that have an economic cost to the producer (i.e., the farmer should not be expected to cover the costs of public goods). It has been difficult to develop such mechanisms that function well for smallholder farmers. Organizing large numbers of farmers to receive incentives through cooperatives, and policies that link education and subsidies to promote resource conserving practices, are some of the approaches being considered. Overall, there is growing support for the approach of support for farmers as land managers, whose choices determine whether agricultural lands provide a range of ecosystem services. This is embedded in the philosophy of land sharing (sharing land functions through mixed landscapes that achieve environmental and social services along with agricultural provisioning). Land sharing stands in contrast to an emphasis on land sparing (where high-input agriculture with consequent high yields potentially frees up land that can be devoted to nature and ecosystems services)—which has rarely been achieved in practice. Further research is needed to understand pathways and fiscal arrangements that lead to food systems that are productive and sustainable, and meet public and private needs. A think piece on SI by IIED (Cook et al., 2015) suggests that SI should focus on the supply side of the global food system. It is fully acknowledged that additional approaches will be needed to tackle consumption and consumer waste, food access and entitlements, markets, and power. They agree with the need to provide incentives to farmers to drastically reduce the

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environmental impacts of crop and livestock production, but in addition recommend the following: G






Promote low-cost approaches under local control by farmers and communities; Enable and invest in innovation and adaptation (including adaptation to climate change); Recognize the important role of public sector funding for agricultural research; Discourage the use of highly productive croplands to grow animal feed; Address the energy needs of smallholders while limiting fossil fuel intensity and reducing GHG emissions; Strengthen the voice of smallholders and vulnerable groups in decisions about agriculture and land use; Focus on enhancing the economic value of farming, as well as its productivity.

These are important goals, ones that require the ingenuity and innovation of current and coming generations. To provide benchmarks along the way, we strongly support the development of indicators of SI, with practical metrics that are widely agreed upon and used in the field. These are needed to clearly define the functions of and expectations from SI, and to monitor progress and performance against these. The domains of SI have been expanded beyond production, economics, and environment to include social and human wellbeing, with an emerging consensus that sustainability is more than environmental protection, it is rooted in local knowledge and justice (Loos et al., 2014). One of the grand challenges facing agronomists and change agents in agricultural development is how to support SI, and agree on metrics that reflect all five domains as a crucial next step along that road.

REFERENCES Bellete, T., 2015. Soil fertility mapping and fertilizer recommendations in Ethiopia. Update on the EthioSIS project and status of fertilizer blending plants. 2nd IPI-MoANR-ATA-Hawassa University Joint Symposium; 24 Nov 2015. Boserup, E., 1965. The Conditions of Agricultural Growth: The Economics of Agrarian Change Under Population Pressure. Allen and Unwin, London, UK. Boserup, E., 1970. Woman’s Role in Economic Development. Allen and Unwin, London. Cook, S., Silici, L., Adolph, B., Walker, S., 2015. Sustainable Intensification Revisited. IIED Issue Paper. IIED, London. FAO, 2001. Conservation agriculture: case studies in Latin America and Africa. FAO Soils Bulletin 78. FAO, Rome. FAO, 2014. The State of Food and Agriculture: Innovation in Family Farming. FAO, Rome. Garnett, T., Godfray, C., 2012. Sustainable intensification in agriculture. Navigating a course through competing food system priorities. Food Climate Research Network and the Oxford Martin Programme on the Future of Food. University of Oxford, UK.


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Garnett, T., Appleby, M.C., Balmford, A., Bateman, I.J., Benton, T.G., Bloomer, P., et al., 2013. Sustainable intensification in agriculture: premises and policies. Science Vol 341, 33 34, 5 July 2013. Godfray, H.C.J., Beddington, J.R., Crute, I.R., Haddad, L., Lawrence, D., Muir, J.F., et al., 2010. Food security: the challenge of feeding 9 billion people. Science 327, 812 818. Gu, H., Yuanmei, J., Liang, L., 2012. Strengthening the socio-ecological resilience of forestdependent communities: the case of the Hani Rice Terraces in Yunnan, China. Forest Policy Econ. 22, 53 59. Hertel, T.W., 2011. The global supply and demand for agricultural land in 2050: a perfect storm in the making? Am. J. Agr. Econ. 93, 259 275. Isaacs, K., Snapp, S., Chung, K., Waldman, K., Assessing the value of diverse cropping systems under a new agricultural policy environment in Rwanda. Food Security, In Press. Jayne, T., Chamberlin, J., Headey, D., 2014. Land pressures, the evolution of farming systems, and development strategies in Africa: a synthesis. Food Policy 48, 1 17. Loos, J., Abson, D., Chappell, M., Hanspach, J., Mikulcak, F., Tichit, M., et al., 2014. Putting meaning back into sustainable intensification. Fron. Ecol. Environ.. Available from: http:// Lotte, W., Descheemaeker, K., Giller, K., 2015. Adoptability of sustainable intensification technologies in dryland smallholder farming systems of West Africa. Research report No. 64. ICRISAT, Patencheru, India, 84 pp. Petersen, B., Snapp, S., 2015. What is sustainable intensification: views from experts. Land Use Policy 46, 1 10. Pretty, J.N., 1997. The sustainable intensification of agriculture. Nat. Resour. Forum 21, 247 256. Pretty, J., Toulmin, C., Williams, S., 2011. Sustainable intensification in African agriculture. Int. J. Agr. Sustain 9, 5 24. Reardon, T., Crawford, E., Kelly, V., Diagana, K., 1995. Promoting farm investment for sustainable intensification of African Agriculture. MSU International Development Paper #18. Michigan State University, Michigan. Robertson, G.P., Gross, K., Hamilton, S., Landis, D., Schmidt, T., Snapp, S., et al., 2014. Farming for services: an ecological approach to production agriculture. Bioscience 64, 404 415. Smith, A., S.S. Snapp, R. Chikowo, P. Thorne, M. Bekunda and J. Glover Measuring sustainable intensification in smallholder agroecosystems: a review. Agronomy for Sustainable Development, Ms. in review. Tadesse, M.A., Shiferaw, B., Erenstein, O., 2015. Weather index insurance for managing drought risk in smallholder agriculture: lessons and policy implications for sub-Saharan Africa. Agr. Food Econ. In press. Available from: Tiffen, M., Mortimore, M., Gichuki, F., 1994. More People, Less Erosion: Environmental Recovery in Kenya. Wiley and Sons, Chichester, UK. Tilman, D., Balzer, C., Hill, J., Befort, B.L., 2011. Global food demand and the sustainable intensification of agriculture. Proc. Natl. Acad. Sci. 108, 20260 20264. United Nations (2014). The Road to Dignity by 2030: Ending Poverty, Transforming All Lives and Protecting the Planet. Synthesis Report of the Secretary-General on the Post-2015 Agenda Dignity_by_2030.pdf. Van Zanten, H., Mollenhorst, H., Klootwijk, C., van Middelaar, C., de Boer, I., 2015. Global food supply: land use efficiency of livestock systems. Int J Life Cycle Assess. Published online 12, August 2015.