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|Title: ||Evaluation of cowpea genotypes for variations in their contribution of N and P to subsequent maize crop in three agro-ecological zones of West Africa|
|Authors: ||Abaidoo, Robert C.|
Okogun, J. A.
|Issue Date: ||2007|
|Publisher: ||Advances in Integrated Soil Fertility Management in Sub-Saharan Africa: Challenges and Opportunities|
|Citation: ||Advances in Integrated Soil Fertility Management in Sub-Saharan Africa: Challenges and Opportunities, 401–412|
|Abstract: ||Cowpea is an important source of food, cash, and fodder inWest Africa. It is perceived to be tolerant to low available
soil phosphorus (P) conditions and nodulates promiscuously contributing to soil fertility through its high nitrogen
(N)-fixing capacity. Cowpea can contribute substantial amounts of N to a subsequent cereal crop but little is known
of the effect of cowpea on P nutrition of a cereal crop grown in rotation. This study, therefore evaluated eight cowpea
genotypes for N2 fixation, tolerance to low soil P (0P), and response to P fertilizer application (90 kg P ha−1 as
Rock Phosphate (RP) or 30 kg P ha−1 as Triple Superphosphate (TSP)), and their potential contribution of N and
P to a subsequent maize crop in three agroecological zones (at Shika, northern Guinea savanna; at Fashola, derived
savanna; and Davié, coastal savanna). Grain yield and P uptake of cowpea genotypes were influenced by location.
Relative response of cowpea genotypes to P application was highest at Shika where soil resin P content was lowest.
The responses to RP application across locations ranged from –14 to 94%; and 194 to 358% for TSP application.
Variation between genotypes was minimal within the 0P and RP treatments but more pronounced within the TSP
treatment at all the locations. The results showed that N2 fixation, N exported in grain, and N balances of cowpea
genotypes were different depending on P nutrition conditions. Grain yield of maize following cowpea was influenced
largely by the previous cowpea genotype through its N and P dynamics, location, and VAM colonization of
roots. There was, however, no consistent evidence of a significant effect of P applied to the legume, on the residual
value to the subsequent maize crop.|
|Description: ||An article published by Advances in Integrated Soil Fertility Management in Sub-Saharan Africa: Challenges and Opportunities, 401–412
|Appears in Collections:||College of Science|
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