M. A. Muhamman is a professor in Department of Crop Science, Adamawa State University, Nigeria.


Field experiments were carried out in 2009 and 2010 rainy seasons at the Teaching and Research Farm, Faculty of Agriculture, Bayero University, Kano, Nigeria to study the response of cowpea to Aqueous extract of moringa and Nitrogen rates. The need to increase yield of cowpea becomes pertinent due to it is extensive use in households to meet up with the daily protein needs as an alternative to meat which is beyond the reach of a poor. Moringa shoot were crushed with water (10 kg of fresh material in 1 liter of water) and filtered out. Liquid extract were then diluted with water in the following concentrations: 0%, 3%, 4% and 5%. These treatments with 3 N rates (0, 10 and 20 kg N ha-1) in a factorial combination were tested on cowpea in an experiment laid out in a Randomized Complete Block Design with three replications. Foliar spraying of aqueous extract of moringa was done at fortnightly from 2 to 8 weeks after sowing. Data were taken on canopy height, number of branches per plant, LAI, pod length and grain yield per hectare and were subjected to analysis of variance. Results showed a significant effect of treatments with interactions on most of the characters measured. Based on the results, it was concluded that moringa extract can compliment N on the production of cowpea. Thus, 20 kg N ha-1 with 4% aqueous extract of moringa should be adopted.
Keywords: Aqueous extract of moringa, Nitrogen and cowpea.