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| Genotypic variation of soybean for phosphorus use efficiency and their contribution of N and P to subsequent maize crops in three ecological zones of West Africa, Abaidoo, R., Sanginga, N., Okogun, J., Kolawole, G., Diels, J . and Tossah, B.*, in: In Demand driven technologies for sustainable maize production in West and Central Africa, pages 194-224, WECAMAN; International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, 2007. |
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| Evaluation of cowpea genotypes for variations in their contribution of N and P to subsequent maize crop in three agro-ecological zones of West Africa, Abaidoo, R., Okogun, J., Kolawole, G., Diels, J ., Randall, P. and Sanginga, N., pages 401-412, Springer, ISBN 978-1-4020-5759-5, 2007. |
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| Evaluation of maize yield in an on-farm maize-soybean and maize-lablab crop rotation systems in the northern Guinea Savanna of Nigeria, Okogun, J., Sanginga, N. and Abaidoo, R., in: Pakistan Journal of Biological Sciences, volume 10, number 21, pages 3905-3909, ISSN 1028-8880, 2007. |
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| On-farm evaluation of biological nitrogen fixation potential and grain yield of Lablab and two soybean varieties in the northern Guinea savanna of Nigeria, Okogun, J., Sanginga, P., Abaidoo, R., Dashiell, K. and Diels, J ., in: Nutrient Cycling in Agroecosystems, volume 73, number 2-3, pages 267-275, ISSN 1385-1314, 2005. |
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| Soybean yield determinants and response to rhizobial inoculation in an on-farm trial in the northern Guinea savanna of Nigeria, Okogun, J., Otuyemi, B. and Sanginga, P., in: West African Journal of Applied Ecology, volume 6, pages 30-39, 2004. |
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| Residual benefits of promiscuous soybean to maize (Zea mays L.) grown on farmers' fields around Minna in the southern Guinea savanna zone of Nigeria, Osunde, A. O.*, Bala, A.*, Gwam, M.*, Tsado, P.*, Sanginga, N. and Okogun, J., in: Agriculture, Ecosystems and Environment, volume 100, number 2-3, pages 209-220, ISSN 0167-8809, 2003. |
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| Can introduced and indigenous rhizobial strains compete for nodule formation by promiscuous soybean in the moist savanna agroecological zone of Nigeria?, Okogun, J. and Sanginga, N., in: Biology and Fertility of Soils, volume 38, pages 26-31, ISSN 0178-2762, 2003. [DOI] |
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| The contribution of nitrogen by promiscuous soybeans to maize based cropping the moist savanna of Nigeria, Sanginga, N., Okogun, J., Vanlauwe, B. and Dashiell, K., in: Plant and Soil, volume 241, pages 223-231, ISSN 0032-079X, 2002. [DOI] |
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| Nitrogen contribution of promiscuos soybeans in maize-based cropping systems, Sanginga, P., Okogun, J., Vanlauwe, B., Diels, J ., Carsky, R. and Dashiell, K., pages 157-177, Soil Science Society of America (SSSA); American Society of Agronomy, 2001. |
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| Nitrogen contribution of five leguminous trees and shrubs to alley cropped maize, Okogun, J., Sanginga, P. and Mulongoy, N., in: Agroforestry Systems, volume 50, pages 123-126, 2000. |
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| Nitrogen fixation and N contribution by promiscuous nodulating soybeans in the southern Guinea savanna of Nigeria, Sanginga, N., Dashiell, K., Okogun, J. and Thottappilly, G., in: Plant and Soil, volume 195, pages 257-266, ISSN 0032-079X, 1997. |
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| Evaluation of symbiotic properties and nitrogen contribution of mucuna to maize grown in the derived savanna of West Africa, Sanginga, N., Ibewiro, B., Houngnandan, P.*, Vanlauwe, B., Okogun, J., Akobundu, I. and Versteeg, M., in: Plant and Soil, volume 179, pages 119-129, 1996. |
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| Persistence and effectiveness of rhizobia nodulating promiscuous soybeans in moist savanna zones of Nigeria, Sanginga, N., Abaidoo, R., Dashiell, K., Carsky, R. and Okogun, J., in: Applied Soil Ecology, volume 3, pages 215-224, ISSN 0929-1393, 1996. |
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| Nodulation and estimation of symbiotic nitrogen fixation by herbaceous and shrub legumes in Guinea Savanna in Nigeria, Sanginga, N., Wirkam, L. E. and Okogun, J., in: Biology and Fertility of Soils, volume 23, pages 441-448, 1996. |
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| Phosphorus requirement and nodulation of herbaceous and shrub legumes in low P soils of a Guinean Savanna in Nigeria, Sanginga, N., Okogun, J., Akobundu, I. and Kang, B., in: Applied Soil Ecology, volume 3, number 3, pages 247-255, ISSN 0929-1393, 1996. |
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| Screeing of multipurpose trees for alley cropping on Alfisol and Ultisol, Okogun, J., Mulongoy, K., Odu, C. T. I. and Agboola, A. A., in: Recent development in biological nitrogen fixation research in Africa: proceedings of the 5th International Conference of the African Association for Biological Nitrogen Fixation (AABNF), 14-19 September 1992, Rabat, Morocco, pages 551-562, Hassan II Institute of Agronomy and Veterinary Medicine, 1994. |
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| Nitrogen fixation and N contribution of selected trees in alley cropping system, Mulongoy, K., Owoaje, B. T., Ibewiro, B. and Okogun, J., pages 824, 1988. |
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| Differences in mycorrhizal infections and P uptake of sweet potato cultivars (Ipomoea batatas L.) during their early growth in three soils, Mulongoy, K., Callens, A. and Okogun, J., in: Biology and Fertility of Soils, 1988. |
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