Agricultural success from Africa: the case of fertilizer tree systems in southern Africa (Malawi,Tanzania, Mozambique,Zambia and Zimbabwe)

In response to the declining soil fertility in southern Africa and the negative effects that this leads to, such as food insecurity besides other developmental challenges, fertilizer tree systems (FTS) were developed as technological innovation to help smallholder farmers to build soil organic matter and fertility in a sustainable manner. In this paper, we trace the historical background and highlight the developmental phases and outcomes of the technology. The synthesis shows that FTS are inexpensive technologies that significantly raise crop yields, reduce food insecurity and enhance environmental services and resilience of agro-ecologies. Many of the achievements recorded with FTS can be traced to some key factors: the availability of a suite of technological options that are appropriate in a range of different household and ecological circumstances, partnership between multiple institutions and disciplines in the development of the technology, active encouragement of farmer innovations in the adaptation process and proactive engagement of several consortia of partner institutions to scale up the technology in farming communities. It is recommended that smallholder farmers would benefit if rural development planners emphasize the merits of different fertility replenishment approaches and taking advantage of the synergy between FTS and mineral fertilizers rather than focusing on ‘organic vs. inorganic’ debates.     

Conservation agriculture practices adopted in southern Brazil

The adoption of conservation agriculture (CA) practices are essential for soil and water conservation. In CA, farmers must adopt no-tillage (NT) with crop rotation to maintain a permanent soil cover. In Brazil, mainly in the South region, for CA to be more efficient, practices such as contour farming and agricultural terraces should also be adopted. Thus, the objective of this study is to determine the extent to which NT has been adopted with crop rotation and others soil and water conservation practices. Data from the Agricultural Census in Paraná State, southern Brazil, were used. For the data analysis, the relationship between the level of adoption of NT and the use of crop rotation, contour farming and agricultural terraces was analyzed. A factor and cluster analysis were performed to distinguish regions in terms of soil and water conservation practices. The results show good overall soil and water conservation practices, although heterogeneity has been observed in the adoption practices between regions. Adoption of NT is high in almost all the studied regions. The conservation practice most widely used with NT is contour farming, whereas the least used is agricultural terraces. Conservation practices for runoff control are being neglected by farmers.     

Understanding the adoption of a portfolio of sustainable intensification practices in eastern and southern Africa

This paper explores smallholder farmers’ adoption decisions of multiple sustainable intensification practices (SIPs) in eastern and southern Africa. We develop a multivariate probit model using plot-level data gathered from maize–legume farming systems in Ethiopia, Kenya, Malawi, and Tanzania. We find that some practices used in maize production are complementary while others are substitutable. The adoption of SIPs is influenced by social capital and networks, quality of extension services, reliance on government support during crop failure, incidence of pests and diseases, resource constraints, tenure security, education, and market access. The results provide insight into the further efforts needed to encourage greater adoption of SIPs.     

Tidal river management for sustainable agriculture in the Ganges-Brahmaputra delta: Implication for land use policy

The tidal river management (TRM) approach is an indigenous management practice in the Southwest part of the Ganges-Brahmaputra delta in Bangladesh. This approach has a high potential for extending area under agriculture with a positive impact on sustainable production and consequently on sustainable land use planning. Until recently, no studies provide a quantitative assessment on agricultural benefits of TRM operation. In this study, we aim to assess the benefits of TRM operation by using innovative approaches such as comparing land use change, agricultural production and economic cost-benefit analysis for two scenarios (with and without TRM) in the Hari-Teka-Bhadra catchment. We found that the financial benefit of TRM operation was 85.5 million US dollar per year from the agriculture sector. The results are useful for promoting land use policy through TRM approach in achieving greater sustainability in the area.     

山东省农业资源环境及可持续发展战略

分析了山东省农业资源环境现状 ,定量分析山东省农业可持续发展的战略目标 ,提出了实现山东省农业可持续发展的对策。     

Integration of conservation agriculture in smallholder farming systems of southern Africa: identification of key entry points

A component-omission experiment based on the principle of conservation agriculture (CA) was established on smallholder farms for three seasons in Murehwa and Hwedza districts, Zimbabwe; Barue district in Mozambique; Balaka district and Chitedze Research Station in Malawi, and Monze district in Zambia to identify strategies for improving crop productivity and livelihoods for smallholder farmers. The objective of the experiment was to evaluate the effect of tillage, residue retention, fertiliser application and weed control on maize yield. In addition, the study analysed possible combinations of these factors that could provide a sustainable entry point for intensification through CA. Results showed that fertilisation had the strongest effect on crop yield in both tillage systems; adequate fertilisation is therefore key to success in CA. Retention of crop harvest residues increased yield in no-tillage systems; no-tillage without residues depressed yield by 50% when compared with yields of conventional tillage. A step-wise integration of CA into the smallholder farming systems is proposed as a possible strategy to avoid new constraints on smallholder farms. If resources are limiting, farmers may apply all principles on small areas to overcome the initial demand in resources (labour, fertiliser and residues), and once productivity is raised, they can expand.     

Red clover (Trifolium pratense) in conservation agriculture: a compelling case for increased adoption

The rapidly growing population will soon require a near doubling of food production. This increase must be achieved in a manner that maintains environmental integrity, preserves public health and resolves food access and distribution equalities. The use of forage legumes in arable rotations can make significant and multidimensional contributions to this sustainable intensification and this paper reviews the potential contribution of red clover (Trifolium pratense L.), with particular reference to sustainable cereal production in conservation agriculture systems. The use of red clover as a tool in soil fertility-building and the multiple benefits to the cropping system in which it is used is described. The benefits discussed include atmospheric nitrogen fixation, soil conservation, structural soil improvements and a suite of agroecosystem services including increased soil microbial activity, the phytoremediation of polluted soils and the provision of food for pollinators. Reported allelopathic weed suppression by red clover cover crops and the role of modern plant breeding in creating new varieties that further enhance system sustainability is also discussed. Finally, as economic considerations will always impact on adoption rates, the profitability of red clover rotations in terms of silage value and yield benefits is taken into account.     

Science-policy interfaces for sustainable climate-smart agriculture uptake: lessons learnt from national science-policy dialogue platforms in West Africa

Connecting science with policy has always been challenging for both scientists and policymakers. In Ghana, Mali and Senegal, multi-stakeholder national science-policy dialogue platforms on climate-smart agriculture (CSA) were setup to use scientific evidence to create awareness of climate change impacts on agriculture and advocate for the mainstreaming of climate change and CSA into agricultural development plans. Based on the platforms' operations and achievements, we used semi-structured questionnaire interviews and reviewed technical reports produced by the platforms to analyse how their modes of operation and achievements improve understanding of the science-policy interfaces between agricultural and climate change decision making. Results showed that these platforms constitute an innovative approach to effectively engaging decision-makers and sustainably mainstreaming climate change into development plans. Effective science-policy interaction requires: (a) institutionalizing dialogue platforms by embedding them within national institutions, which improves their credibility, relevance and legitimacy among policymakers; (b) two-way communication, which contributes substantially to the co-development of solutions that address climate change vulnerabilities and impacts; and (c) relevant communication products and packaging of evidence that aligns with country priorities, which facilitates its uptake in policy-making processes. We conclude with a framework of sustainable operation for such platforms based on lessons learnt in the three countries.     

Estimating shadow price for symbiotic nitrogen and technical efficiency for legume‐based conservation agriculture in Malawi

Determining the value of legumes as soil fertility amendments can be challenging, yet this information is required to guide public policy and to incentivise prescribed land‐management practices such as conservation agriculture. We use a directional input distance function (DIDF) to estimate shadow prices for symbiotic nitrogen and the technical efficiency for mixed maize‐legume production systems in Malawi. The shadow prices reflect the trade‐off between fertiliser nitrogen and symbiotic nitrogen required to achieve a given quantity of output. Our results reveal considerable technical inefficiency in the production system. The estimated shadow prices vary across farms and are, on average, higher than the reference price for commercial nitrogen. The results suggest that it would be beneficial to redesign the current price‐support programs that subsidise chemical fertilisers and indirectly crowd‐out organic soil amendments such as legumes.     

Agricultural modernization and sustainable agriculture: contradictions and complementarities

This paper explores the relations between agricultural modernization and sustainable agriculture. The point of departure is the observable decrease in the sustainability and social–ecological resilience of agricultural and food systems. We ask where, precisely, the notions of agricultural modernization and agricultural sustainability contradict each other. In more concrete terms we ask what forms of modernization makes agriculture more (or less) sustainable. Our literature review shows that while the term ‘sustainable agriculture’, has been extensively debated, the term ‘agricultural modernization’, while carrying a positive and forward-looking connotation, remains poorly defined. To address this gap, we draw on evidence from real-life cases in fourteen countries in an attempt to interpret how the two concepts are perceived in very different contexts. These case studies show that different understandings of modern and sustainable agriculture coexist and that agricultural development follows diverse pathways. We conclude that the growing demands for an agricultural and food system that is more resilient, equitable and inclusive can be met by providing more support for the many divergent trajectories of agricultural modernization that practitioners are actually pursuing: trajectories that are often more attuned to the imperatives of ecology and to changing socio–economic preferences than the classical modernization trajectory.     

Agronomic considerations for urban agriculture in southern cities

Urban and peri-urban agriculture (UA) provide a significant contribution to the total food requirements of cities, especially in southern cities of the developing world. Increasing food production in UA is therefore a necessity for increasing the food security of the urban poor. Urban environments are inherently different from rural environments and these differences in environmental conditions are expected to impact differently on crop growth. This review describes agronomic issues that are unique to UA and identifies possible interventions to address them. The constraints that can significantly differ include temperature, air quality, solar radiation and climate. The growth-limiting and growth-reducing factors that affect actual production in UA include water availability, nutrient supply, soil degradation, pests and soil pollution. The interventions addressing these constraints require action at both field level, and municipal or regional levels. The food security of the urban poor will therefore require coordinated efforts and cooperation between the farmers who produce food and the planners and policy makers who manage the supporting systems such as markets, inputs and land registration.     

黑龙江省兰西县农业可持续发展对策

农业可持续发展的中心内涵是农村经济社会发展与农业资源、生态环境相协调,其核心是农业资源的永续利用,主要从5方面在剖析问题,指出了4方面发展优势,并提出了推进兰西农业可持续发展的对策。     

常州市农业可持续发展现状及其对策

随着农地制度的改革、农业投入和技术创新活动的加强,常州农业现代化建设取得了较快发展,但农用地面积不断减少、农业投入不足、农业产业化发展缓慢及农业生态环境恶化等问题影响和制约了常州的农业可持续发展,针对性地提出了加强农用地和生态环境的保护、调整和优化农业产业结构、重点扶持龙头企业和增加科技投入等措施,以实现常州农业可持续发展。     

Policy recommendations for enabling transition towards sustainable agriculture in India

Aligning existing agricultural polices with UN-Sustainable Development Goals is imperative for the transition towards a cleaner and planet friendly food production, especially for a geographically and demographically diverse country like India. In this context, the present study focuses on ascertaining the major social and environmental challenges affecting agriculture in India, while evaluating the potential of efficient policy restructure in boosting growth within this sector. The methodology incorporates a quantitative assessment of social, ecological and economic indicators of agricultural sustainability in India, coupled with a co-relation analysis between several nutrition and land-based indicators for leading agriculture states across the country. The results highlight that despite attaining sufficiency in terms of food production, access to food by all in the country remains a major challenge along with incoherence between certain Sustainable Development Goals (SDGs) indicators and their corresponding data values. Furthermore, a critical analysis of operational as well as recommended agriculture and farmer welfare policies indicate that formulation of an overarching policy influencing sustainable management of agricultural systems, combined with proper implementation of social welfare schemes, would lead to the timely realisation of SDG 1 (no poverty), SDG 2 (zero hunger), and SDG 3 (good health and well-being) in India. Consequently, an umbrella policy (National Policy on Eco-Agri-Food Systems) has been proposed by authors for sustainable management of the country’s entire agricultural value chain. Recommendations related to agricultural waste management and adoption of planetary healthy diets have also been suggested for enabling the smooth transition of agriculture as a sustainable enterprise in India.     

Natural Areas, the whole countryside approach and sustainable agriculture

Natural Areas are biogeographical zones which reflect the geological foundation, the natural systems and processes, and the wildlife in different parts of England, and provide a framework for setting objectives for nature conservation. This paper argues, with particular reference to agro-ecosystems, that there is a need for an integrated, whole countryside approach to Natural Areas based on the principles of ‘strong’ sustainable development. In practice, this means the delineation of conservation objectives for the whole of each Natural Area and the application of policy instruments designed to address the causes of environmental loss and deterioration. The latter requires, it is argued, a structural analysis of generic environmental issues. A generic issues approach is required in order to avoid the pitfalls of environmental ‘symptom management’ (environmental managerialism), an approach which dominates current environmental and agri-environmental policy. Necessary as such discrete action programmes and measures may be as short-term ‘fire-fighting’ responses to immediate threats, environmental managerialism as a policy framework epitomises a non-holistic and ‘disintegrated’ approach to nature conservation. The paper goes on to discuss the configuration of agri-environmental policy that will be required to address generic agricultural impacts on biodiversity and the constraints and opportunities for its implementation that are likely to arise within the context of further CAP reform and the forthcoming round of WTO negotiations.     

湿地农业生态系统可持续发展评价--以黑龙江省洪河农场为例

运用农业(农村)可持续化与现代化综合指标体系以1995—1998年的资料为基础，结合实际调查，对洪河农场的整体情况进行评价。     

基于能值分析的黑土农业可持续发展探讨--以哈尔滨市呼兰区康金镇为例

本文运用能值分析理论对以康金镇为代表的黑龙江省耕作黑土生态系统进行研究。结果表明：2005年~2009年康金镇耕作黑土生态系统的总能值投入呈上升的趋势,工业辅助能值占总能值投入的61.8%,其中,自然资源能值占总投入的37.8%,可更新有机能的投入仅占总能值的1.6%。耕作生态系统对于购买能值的依赖使得系统的环境压力增大,环境负载率持续增长。黑龙江黑土耕作系统的净能值产出率低于全国平均水平,并呈逐年下降的趋势。生态系统能值可持续发展指数（ESI）为1.41,可持续发展潜力较大,也呈逐年下降的趋势。这些能值指标表明,农业生态系统处于传统农业向现代农业的过渡阶段,有待于进一步发展。     

Farmer perceptions of legumes and their functions in smallholder farming systems in east Africa

Legumes play an important role in sub-Saharan Africa (SSA) farming systems through the provision of food, feed, fuel, income and a range of biophysical benefits, such as soil fertility enhancement and erosion control. However, their full potential is not being realized. The purpose of this study was to assess farmers’ perceptions and knowledge towards legumes and the rationale of farmers for current legume production practices using a survey of 268 farmers in the Democratic Republic of Congo and Kenya. Most of the farmers had some knowledge of legumes and their characteristics. However, they had little knowledge of some key functions, including soil erosion control and soil fertility improvement. Most farmers relied on radio and other farmers for legume-related information. Farmers with relatively large livestock holdings ranked provision of livestock feed as an important legume function. We conclude that farmers put more value on short-term benefits of legumes including food and income than long-term benefits such as natural resource management and thus grain legumes are more readily identified by farmers than forage species. Also, we conclude that farmers require more than just information about legumes to increase uptake, they also require improved market access to procure inputs and sell products to realize other benefits that are associated with growing legumes.     

Gender and conservation agriculture in sub-Saharan Africa: a systematic review

Conservation agriculture (CA) involves the practice of concurrent minimum tillage, permanent soil cover using crop residue, and crop rotation. Evidence indicates that CA increases agricultural productivity, reduces farming labour requirements, and improves soil quality. While CA is practised in several African contexts, little is known about its interaction with gender. This review synthesized knowledge on the interplay of gender and CA in sub-Saharan Africa. The review highlighted the relative neglect of gender issues in research on CA in SSA. Existing research was limited both in quantity and to a few countries in the region. There was also little critical focus on gender as a social phenomenon: a few of the studies conceptualized gender in terms of the socially constructed roles of men and women while the majority framed it in terms of the sexual categories of male and female. Compared to men, and due largely to gendered barriers, including lack of access to land; machinery; inputs; extension services; and credit facilities, women farmers adopted CA less and dis-adopted it more. CA increased women’s incomes, labour involvement, household food security, as well as risks for land and crop dispossession by men when farming becomes lucrative. It also increased workloads, employment opportunities and health risks for women. CA positively altered gender relations, boosting women’s participation in agricultural decision-making at the household level. Deliberately enlisting women as beneficiaries; working with men to advance their understanding of women’s needs in agriculture; and offering agricultural inputs directly to women are some strategies that enhanced women’s participation in CA. Gaps in current research on gender and CA include: critical focus on and understanding of gender as a social construct in relation to CA; the long-term impacts on CA for gender relations, incomes for men and women, and women’s empowerment; the sustainability of strategies for supporting gendered participation in CA; and the dynamics of gendered access to local farmland markets for CA.     

土地整理与农业可持续发展问题研究

江苏人口众多,土地资源紧缺,经济快速发展过程中土地的非农化速度很快,保护耕地增产粮食,促进农业的可持续发展问题随着人口、经济高速增长而日益受到重视。江苏省开展的土地整理进行农村土地资源的整合,保持耕地总量平衡,完善农业基础设施,有效地提高土地产出,从而促进土地的持续、高效利用,这为江苏省经济持续高速发展的同时,做好耕地、粮食发展战略决策提供科学依据。