Effects of various planting ratios on the performance of maize and cowpea in mixtures
The experiment was conducted at the Teaching and Research Farm of Ambrose Alli University, Ekpoma to evaluate the performance of maize and cowpea planted at various replacement ratios. Weight of grains per plant and grain yield were higher in cowpea in maize-cowpea intercrop planted in ratio 2:1. Based on the total yield and land equivalent ratio (LER) values, the optimum yield ratio was in maize+cowpea planted in ratio 2:1. The planting ratio 1:1 of maize-cowpea intercrop was found to increase the number of root nodules of cowpea at 6 WAP; this also brought corresponding increase in weight of root nodules per plant at 6 WAP. Potassium was higher in the ear leaf of sole maize than in the mixtures and phosphorus was higher in mixture of maize and cowpea planted in ratio 1:1. Maize grain from maize-cowpea intercrop at 1:2 had the highest concentration of N and P. Maize grains from maize-cowpea ratio 1:1 had the highest concentration of Mg, while the highest maize yield was recorded in maize+cowpea intercrop planted in ratio 1:2.
Keywords: Evaluation, ratio, yield, maize and cowpea