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Field experiments were conducted at the Teaching and Research Farm of the   Federal University of Agriculture, Abeokuta (7o 20?N, 30 23?E) during the   2014 early and late cropping seasons to evaluate the effect of weeding   frequency and phosphorus fertilizer application on the growth and grain   yield of the early maturing cowpea variety (Vigna unguiculata L. Walp). The   experiment was laid out in a split-plot arrangement fitted into a Randomized   Complete Block Design with three replications. The main plot consisted of   three phosphorus fertilizer rates (0, 15 and 30 P2O5kg ha-1) while the   subplot comprised five weeding frequencies (no weeding, weed-free, hoe   weeding at 3 weeks after sowing (WAS), hoe weeding at 3 and 6 WAS and   weeding at 3, 6 and 9 WAS). The results showed that plots treated with   phosphorus fertilizer at 15 kg ha-1 produced the highest number of leaves   and the tallest plant in the late season while the highest grain yield was   recorded in the early trials. Weeding at 3, 6 and 9 WAS during the early   season trial gave the highest grain yield compared with other weeding   treatments. Unchecked weed infestation reduced yield by 53.10 % and 49.9 %   in the early and late seasons respectively compared to the maximum obtained   from weed-free plots. This study concluded that application of 15 kg P2O5   ha-1 and weed removal at 3, 6 and 9 WAS were effective for effective weed   control and optimum grain yield in cowpea production.

journal of agricultural sciences

Effect of phosphorus (P) rates and weeding frequency on the growth and grain yield of extra early cowpea (Vigna unguiculata L. Walp) in the forest-savanna agro-ecological zone of southwest Nigeria