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Crop production in sub-Saharan Africa has numerous biotic and abiotic constraints, including nutrient deficiencies. Information on crop response to macronutrients is relatively abundant compared with secondary and micronutrients (SMN). Data from 1339 trial replicates of 280 field trials conducted...


Wortmann, Charles S.Kaizzi, K.C.Maman, N.Cyamweshi, A.Dicko, M.Garba, M.Milner, M.Senkoro, C.Tarfa, B.Tettah, F.Kibunja, C.Muntholi, M.Nalivata, P.Nkonde, D.Nabahungu, L.Ouattara, K.Serme, I.[Diagnosis of crop secondary and micro-nutrient deficiencies in sub-Saharan Africa]Diagnosis of crop secondary and micro-nutrient deficiencies in sub-Saharan Africa
Rachier, Gideon O.Wortmann, Charles S.Tenywa, J.S.[Low soil phosphorus tolerance in common bean as affected by root architecture]Low soil phosphorus tolerance in common bean as affected by root architecture
Rachier, Gideon O.Wortmann, Charles S.Tenywa, J.S.[Phosphorus tolerance in common bean as affected by root architecture]Phosphorus tolerance in common bean as affected by root architecture

Wortmann, Charles S.Fischler, MAAlifugani, FKaizzi, CK[Accomplishments of participatory research for systems improvement in Iganga District, Uganda 1993 to 1997]Accomplishments of participatory research for systems improvement in Iganga District, Uganda 1993 to 1997

Wortmann, Charles S.Eledu, CS[An agroecological zonation for Uganda: methodology and spatial information]An agroecological zonation for Uganda: methodology and spatial information
Ochwoh, Víctor A.Wortmann, Charles S.Lynch, Jonathan P.[Bean improvement for low fertility in Africa (BILFA): IV. Manganese toxicity]Bean improvement for low fertility in Africa (BILFA): IV. Manganese toxicity
Lunze, LubangaWortmann, Charles S.Lynch, Jonathan P.[Bean improvement for low fertility in Africa (BILFA): III. Aluminum toxicity]Bean improvement for low fertility in Africa (BILFA): III. Aluminum toxicity

Management of harvested (senescent) banana pseudostems has implications for efficiency of nutrient use for sole cropped as well as intercropped bananas. Two studies were conducted on aspects of nutrient flows from senescent pseudostems. Sixty one and 55% of the initial N and P, respectively, in s...


Wortmann, Charles S.Karamura, E.B.Gold, C.[Nutrient flows from harvested banana pseudostems]Nutrient flows from harvested banana pseudostems

Characteristics of the major soil groups found in bean-growing areas of Africa (Alfisols, Ultisols, Oxisols, Inceptisols) and associated nutritional disorders are discussed. Soil fertility factors affecting bean growth and N fixation, as evidenced in research conducted in Africa, are reviewed as ...


Mughogho, SKWortmann, Charles S.[Diagnosis of soil fertility constraints in bean based cropping systems: review of research results]Diagnosis of soil fertility constraints in bean based cropping systems: review of research results

Results of research work carried out in Africa on the response of beans to NPK fertilizers, liming, S and other secondary/micronutrients, and organic manures are reviewed. Band or spot placement of P, fertilizer management in multiple crop systems, and correlations between soil data, yields, and ...


Wortmann, Charles S.Zake, JYK[Review of bean responses to applied fertilizers in Africa]Review of bean responses to applied fertilizers in Africa

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