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Management of Organic Inputs in Soils of the Tropics (MOIST) is a rich source of information on green manure/cover crops and hosts an active email discussion group on green manures/cover crops.
The World Agroforestry Centre combines excellence in scientific research and development to address global poverty, hunger and environmental needs through collaborative programs and partnerships that transform lives and landscapes locally and globally.
Trees for the Future is a non-profit organization initiating and supporting agroforestry self-help projects in cooperation with groups and individuals in developing countries.
English nonprofit group conducts research into temperate agroforestry and into all aspects of plant cropping and uses, with a focus on tree, shrub and perennial crops.