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

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

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Farmer participation research for improved soil management por Wortmann, Charles S., Kaizzi, CK

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Income, food security, nutrients and labour: a comparison of key aspects of african smallholder farming systems using IMPACT por Karanja, S., Herrero, Mario, Ridder, N.A. de, Baijukya, Frederick P., Mwale, M, Kaizzi, CK, Mapfumo, Paul, Watat, C, Issaka, R., Sanogo, O.M., Kungu, J., Mugendi, DN, Quirós, Carlos F., Tittonell, Pablo A., González Estrada, E., Giller, Kenneth E.

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Accomplishments of participatory research for systems improvement in Iganga District, Uganda 1993 to 1997 por Wortmann, Charles S., Fischler, MA, Alifugani, F, Kaizzi, CK

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