In the 1980s and 1990s, green manure/cover crop (GMCC) systems became a popular agricultural technology in research and development efforts for smallholder tropical and subtropical farmers. However, few syntheses of these experiences have been conducted. This volume of case studies contributes to bridging this gap by reviewing field-level experiences with these systems.

Twelve case studies are included. Eleven of them describe experiences from Latin America (4 cases), Africa (6 cases) and Asia (1 case) and the twelfth case reports on the development of a GMCC systems database. Two concluding chapters, Learning from the Case Studies' and Future Perspectives', build upon the cases.

The systems described are diverse. Some systems have been spontaneously adopted by farmers, while others have been introduced to the farmers through diffusion efforts. Some of the cases reviewed describe small, localized efforts while others report on large-scale, well-known ones, such as the combination of GMCCs and conservation tillage in Santa Catarina, Brazil, the maize-Mucuna system in northern Honduras, and the improved fallow systems in Eastern Zambia. Most experiences include both development and research aspects and to the extent possible the cases integrate these two. Discussion of the strengths and shortcomings of the systems and efforts is frank, and the goal is to learn from these experiences to benefit future efforts.

It is expected that both researchers and development practitioners and students of tropical farming systems and soil management will find this volume of case studies useful.A

In the 1980s and 1990s, green manure/cover crop (GMCC) systems became a popular agricultural technology in research and development efforts for smallholder tropical and subtropical farmers. However, few syntheses of these experiences have been conducted. This volume of case studies contributes to bridging this gap by reviewing field-level experiences with these systems. Twelve case studies are included. Eleven of them describe experiences from Latin America (4 cases), Africa (6 cases) and Asia (1 case) and the twelfth case reports on the development of a GMCC systems database. Two concluding chapters, `Learning from the Case Studies' and `Future Perspectives', build upon the cases. The systems described are diverse. Some systems have been spontaneously adopted by farmers, while others have been introduced to the farmers through diffusion efforts. Some of the cases reviewed describe small, localized efforts while others report on large-scale, well-known ones, such as the combination of GMCCs and conservation tillage in Santa Catarina, Brazil, the maize-Mucuna system in northern Honduras, and the improved fallow systems in Eastern Zambia. Most experiences include both development and research aspects and to the extent possible the cases integrate these two. Discussion of the strengths and shortcomings of the systems and efforts is frank, and the goal is to learn from these experiences to benefit future efforts. It is expected that both researchers and development practitioners and students of tropical farming systems and soil management will find this volume of case studies useful.

"What Dr Samuel Johnson did for English, Professor Amir Kassam has done for Conservation Agriculture (CA). He is eminently well qualified and has enlisted more than a hundred battle-hardened champions to contribute 26 chapters amounting to over a thousand scholarly pages. The content is formidable. Volume one, Systems and Science, embraces: the need for CA; global developments; soil health and landscape management; the roles of minimum soil disturbance, mulch and cover crops; crops and cropping systems, vegetable systems, perennial systems; integration of cropping and livestock; mechanization; certification; institutional and policy support. Volume two, Practice and Benefits, includes management of crops and cropping systems, soil, weeds, insect pests and disease, nutrients, carbon, and biodiversity; climate change mitigation and adaptation; benefits to farmers and society; ecosystem services; and rehabilitation of degraded farmland...This book can change the future."review by David Dent in International Journal of Environmental Studies This volume summarises research on key components for successful Conservation Agriculture (CA). Chapters review the latest research on ways of optimising no-till techniques to minimise soil disturbance in relation to seeding, weeding and other operations. Chapters also review ways to improve soil health in CA, including mulch cover, cover crops, rotations and intercropping. The book also includes case studies on optimising CA in particular systems, including rice, root, tuber and horticultural crops as well as integrating livestock in CA systems. The book concludes by looking at certification schemes and institutional support to promote good CA practice.

"It represents a truly magnum opus, contains copious references, and represents a distillation of the experience of scores of farmers, researchers and extension practitioners... To find such a wealth of practically-rooted experience on adoption and spread of Conservation Agriculture (CA) in this single Volume 3 of the series on CA is a triumph of hard work and wise collation which deserves widespread perusal by farmers and their organisations, researchers and policy-makers. At a time of such global challenge environmentally and in terms of ecosystem security, this book is timely indeed. May it achieve its aim to persuade and inform more adopters of CA." (Professor John Wibberley, Ag4Dev) "...this new volume is timely. More than 120 authors from more than 30 countries contribute global evidence and knowledge drawn together into a short survey and sixteen regional chapters, each including useful context and a section on where to look for further information...Our review of the first two volumes concluded: 'This book can change the future.' Chapters in this volume give us a glimpse of that future."(David Dent, International Journal of Environmental Studies) "The whole series is a magnificent achievement and will be the principal reference for years to come." (David Dent) With growing scientific concern around the limitations of tillage-based agriculture, coupled with the sector's need to contribute to being more sustainable, the development and adoption of alternative farming techniques has never been more important. Conservation Agriculture (CA) is emerging as a key alternative. The foundations of CA are built upon the use of no-till techniques and the use of rotations and cover crops to optimise different aspects of soil and crop health and resilience. Advances in Conservation Agriculture Volume 3: Adoption and Spread provides an authoritative review from an array of international experts on the adoption of CA principles in different regions around the world. The final volume in this collection reviews the effectiveness of CA in differing contexts (e.g. in drier conditions where water conservation is important or in areas with poor soil) and refers to the wealth of research and experiential evidence currently available.