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Africa agrarian reform agreement agricultural alley cropping animals areas Asia breeding buffalo cane Caracalla cassava cattle cent Centre cereal Ceres Community cost Cote d'lvoire coun crops devel developing countries disease economic Edouard Saouma effects environment environmental export farm farmers feed fertilizers field fish fisheries food aid funds GATT genetic gharial global grain Green Revolution groups growing growth harvest hectares important improve increase indigenous knowledge industry inputs irrigation Kenya labor land Latin livestock maize ment milk million oilseeds operating organic Oxfam P.O. Box peasant pest Phylloxera plant nutrients population problems production region rice road rodents rural scientists sector seeds social soil Somalia species stocks structural adjustment subsidies sustainable tion tons trade traditional transport tropical ture United varieties Vetiver women workers World Bank yields Zimbabwe