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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/9786

Title: On-farm evaluation of biological nitrogen fixation potential and grain yield of Lablab and two soybean varieties in the northern Guinea savanna of Nigeria
Authors: Okogun, J. A.
Sanginga, N.
Abaidoo, R.
Dashiell, K. E.
Diels, J.
Keywords: Biological nitrogen fixation
Grain yield
Northern Guinea savanna
Issue Date: 2005
Publisher: Nutrient Cycling in Agroecosystems
Citation: Nutrient Cycling in Agroecosystems (2005) 73:267–275; DOI 10.1007/s10705-005-3821-7
Abstract: Several legumes with high biological nitrogen fixation (BNF) potentials have been studied in on-station trials. The processes involved in BNF and the benefits of these species to crop production need to be evaluated using farmers’ management practices in farmers’ fields. An on-farm trial with 20 farmers was conducted in the northern Guinea savanna (NGS) of Nigeria. The aims were to evaluate the BNF potentials of an improved soybean variety (TGx 1448-2E) and a local variety (Samsoy-2) when inoculated with Bradyrhizobium strains, and of Lablab in farmer-managed and researcher-managed soybean-maize and Lablab-maize crop rotation systems. The level of soil P was generally low with more than 50% of the fields having less than the critical P level. The plant available P content was statistically significantly (P = 0.05) correlated with P in grain (r = 0.60), P in the shoot (r = 0.68), grain yield (r = 0.40) and nodule weight (r = 0.35). Variations in plant parameters (nodulation, shoot dry matter, percentage nitrogen derived from the air [%Ndfa], grain yield, and nutrient uptake) among and within farmers’ fields were attributed to differences in soil fertility and crop management. About 60% of the fields were moderately fertile, sufficient to support legume establishment, while about 30% of the farmers’ fields had a low fertility level. For farmers in the study area to benefit from the BNF potentials of the legumes, an external P fertilizer input was necessary as well as suitable crop management practices because all parameters measured in the researcher-managed plots were higher than in the farmer-managed plots.
Description: An article published by Nutrient Cycling in Agroecosystems (2005) 73:267–275; DOI 10.1007/s10705-005-3821-7
URI: http://hdl.handle.net/123456789/9786
Appears in Collections:College of Science

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