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Soybean yield determinants and response to rhizobial inoculation in an onfarm trial in the northern Guinea savanna of Nigeria by Okogun, J., Otuyemi, B., Sanginga, P.

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Differences in mycorrhizai infection and P uptake of sweet potato cultivars (Ipomoea batatas L.) during their early growth in three soils by Mulongoy, K., Callens, A., Okogun, J.

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Onfarm evaluation of biological nitrogen fixation potential and grain yield of Lablab and two soybean varieties in the northern Guinea savanna of Nigeria by Okogun, J., Sanginga, Nteranya, Abaidoo, Robert C., Dashiell, Kenton E., Diels, J.

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The contribution of nitrogen by promiscuous soybeans to maize based cropping the moist savanna of Nigeria by Sanginga, N., Okogun, J., Vanlauwe, Bernard, Dashiell, Kenton E.

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Nitrogen contribution of five leguminous trees and shrubs to alley cropped maize by Okogun, J., Sanginga, P., Mulongoy, N.

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