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Wortmann, Charles S. ,  Kaizzi, CK ,  Fischler, MA ,  [Farmers` independent experimentation with green manure and/or cover crops: a component of participatory research for improving Ugandan farming systems] ,  Farmers` independent experimentation with green manure and/or cover crops: a component of participatory research for improving Ugandan farming systems

Wortmann, Charles S. ,  Kaizzi, CK ,  [Tree legumes in medium-term fallows: Nitrogen, fixation, nitrate recovery and effects on subsequent crops] ,  Tree legumes in medium-term fallows: Nitrogen, fixation, nitrate recovery and effects on subsequent crops