Phosphorus And Nitrogen Fertilization Of Soybean In The Nigerian Savanna

Kamara, Alpha Y. and Ekeleme, Friday and Omoigui, Lucky O. and Aheigbe, Hakeem A. (2011) Phosphorus And Nitrogen Fertilization Of Soybean In The Nigerian Savanna. Experimental Agriculture. pp. 1-10.

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Soybean (Glycine max) is a major cash crop in the savannas of Nigeria although productivity is typically constrained by poor soil fertility. The objective of this research was to determine the interactive effect of N and P on soybean productivity in the northern Guinea and Sudan savannas of northeast Nigeria. Experiments were conducted using locally adapted early and late maturing cultivars. Two rates of N and three rates of P fertilizer were also compared at both sites over two years. At both sites, pods plant−1 and seed yield were higher in 2006 than in 2007, possibly due to better rainfall distribution in 2006. Nitrogen fertilizer had no significant effect on seed yield or pods plant−1. Application of P fertilizer increased pods plant−1 by 40–66%. Averaged across site and year, seed yield with no P was 1057.2 kg ha−1 while yield with 20 and 40 kg ha−1 P were 1941.0 kg ha−1 and 2371.5 kg ha−1, respectively. No significant interaction effect between N and P fertilizer on seed yield and pods plant−1 was observed. The late maturing cultivar yielded less than the earlier maturity group cultivar in 2007 likely due to moisture stress. For optimum seed yield 40 kg of P fertilizer ha−1 is recommended for soybean production in both locations. Our results suggest that N fertilizer is not critical for soybean production in this area.

Item Type: Article
Uncontrolled Keywords: Soyabean
Subjects: Others > Fertilizer Applications
Depositing User: Mr Siva Shankar
Date Deposited: 10 Feb 2012 10:51
Last Modified: 14 Sep 2013 12:13
Official URL:
Acknowledgement: The authors would like to thank the Canadian International Development Agency (CIDA) for funding the Project, Promoting Sustainable Agriculture in Borno State (PROSAB), which sponsored this study. The field technicians at IITA/PROSAB are acknowledged for managing the research fields and R. Umelo for editorial assistance.
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