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Journal of Agronomy
  Year: 2008 | Volume: 7 | Issue: 3 | Page No.: 258-264
DOI: 10.3923/ja.2008.258.264
Genotype Effects of Cowpea and Soybean on Nodulation, N2-fixation and N Balance in the Northern Guinea Savanna of Nigeria
A.A. Yusuf, R.C. Abaidoo, E.N.O. Iwuafor and O.O. Olufajo

Abstract:
This study was designed to evaluate N2-fixation and N balance of improved cowpea and soybean genotypes in the NGS of Nigeria. Field experiments were conducted in 2003 and 2004 to assess nodulation, N2 fixation and N contribution of two cowpea (IT96D-274 and SAMPEA-2) and soybean (SAMSOY-2 and TGx 1448-2E) on a leached ferruginous tropical soil (Haplustalf). The legume genotypes and a reference maize crop (Oba Super 2) were planted in randomized complete block design with three replications. The N difference method was used in estimating symbiotic N2 fixation while the N contribution was estimated by the difference between N fixed and N exported in the grain during harvest. Although nodule number did not differ significantly among genotypes, the weight was significantly higher in soybean than cowpea. Significant difference in N2 fixation was only observed between cowpea genotypes and it was attributed to the differences in maturity period. TGx 1448-2E derived on average 49.8 kg N ha-1 or 37% of plant total N from fixation compared to IT96D-724 with 15.8 kg N ha-1 or 19%. In both years, N balance ranged from -30 to 9 kg N ha-1 depending on the genotype. With the exception of SAMPEA-7 in 2003, all genotypes led to a net negative contribution to soil N and a positive N balance was only obtained when the nitrogen harvest index was less than the proportion of Ndfa. The results show that reasonable maize yield may not be obtained following these grain legumes without supplementary N added to the soil.
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How to cite this article:

A.A. Yusuf, R.C. Abaidoo, E.N.O. Iwuafor and O.O. Olufajo, 2008. Genotype Effects of Cowpea and Soybean on Nodulation, N2-fixation and N Balance in the Northern Guinea Savanna of Nigeria. Journal of Agronomy, 7: 258-264.

DOI: 10.3923/ja.2008.258.264

URL: http://scialert.net/abstract/?doi=ja.2008.258.264

COMMENTS
04 May, 2009
Narmadha:
I am so happy with the service of your website.I am doing my PG in Genetics and i am working in cowpea.so this is very useful to me ...Thanks a lot....
 
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