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A field experiment evaluated the impact of seven le gumes cover crops residues incorporated into degraded soil ( Aeschynomene histrix, Centrosema pubescens, Chamaecri sta rotundifolia, Mucuna pruriens, Pueraria phaseoloides, Stylosanthes guianensis and S. Hamata ) on maize yield, N uptake and harvest index in the center of Benin. In July 2003, the cover crops w ere planted and received two level of phosphorus (4 5 P and 0 P) applied in form of Super Phosphate Triple. In May 2004, two split of nitrogen were added on the r esidues of the legumes, 30 days after the planting of maize . Minerals fertilizers (N, P) enhanced maize yield, N uptake, harvest index and N use efficiency. Incorporation o f legumes residues improved more maize productivity than minerals fertilizers. The best grain yield (1793.9 kg DM.ha -1 ) and grain N uptake (149.4 kg N ha -1 ) were obtained with Mucuna pruriens residues incorporated. The combination of N and P to the different residues didn’t improve significantly the maize yields. The maize grain yield is explained to 90% by biomass, h arvest index and nitrogen use efficiency. The proportion o f explained grain N uptake in biomass, harvest inde x and nitrogen use efficiency is 74%. The results demonst rated that growing maize with Mucuna pruriens residue incorporation with NP fertilizers could be more ben eficial in the legume-maize cropping system in the study area. © 2013 International Formulae Group. All rights res erved.

international journal of biological and chemical sciences

Contribution of seven legumes residues incorporated into soil and NP fertilizer to maize yield, nitrogen use efficiency and harvest index in degraded soil in the center of Benin