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Evaluation of symbiotic properties and nitrogen contribution of mucuna to maize grown in the derived savanna of West Africa por Sanginga, N., Ibewiro, B., Houngnandan, P., Vanlauwe, Bernard, Okogun, J.A., Akobundu, I.O., Versteeg, M.

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Phosphate rock utilization by soybean genotypes on a low-P savanna soil and the status of soil P fractions after a subsequent maize crop por Nwoke, O.C., Okogun, J.A., Sanginga, Nteranya, Diels, J., Abaidoo, Robert C., Osonubi, O.

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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 por Abaidoo, Robert C., Sanginga, Nteranya, Okogun, J.A., Kolawole, G.O., Tossah, B.K., Diels, J.

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Phosphorus requirement and nodulation of herbaceous and shrub legumes in low P soils of a Guinean Savanna in Nigeria por Sanginga, N., Okogun, J.A., Akobundu, I.O., Kang, B.T.

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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? por Okogun, J.A., Sanginga, N.

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Nitrogen fixation and N contribution by promiscuous nodulating soybeans in the southern Guinea savanna of Nigeria por Sanginga, N., Dashiell, Kenton E., Okogun, J.A., Thottappilly, G.

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