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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. ,  [Research for sustainable agricultural production systems in high altitude zones of Eastern Africa] ,  Research for sustainable agricultural production systems in high altitude zones of Eastern Africa

Alemayehu, A. ,  Tamado, T. ,  Nigussie, D. ,  Yigzaw, D. ,  Kinde, T. ,  Wortmann, Charles S. ,  [Maize–common bean intercropping to optimize maize-based crop production] ,  Maize–common bean intercropping to optimize maize-based crop production