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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 ×
Sanginga, N
Abaidoo, R
Dashiell, K
Diels, Jan #
Issue Date: 2005
Publisher: Kluwer
Series Title: Nutrient cycling in agroecosystems vol:73 pages:267-275
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.
ISSN: 1385-1314
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Earth and Environmental Sciences
Division Soil and Water Management
× corresponding author
# (joint) last author

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