Article Number: DRJBB9012753612
Vol. 7, Pp. 37-40, 2021
Copyright © 2021
Author(s) retain the copyright of this article
Original Research Article
Effect of partial replacement of organic fertilizer with Sokoto phosphate rock on the performance of forage cowpea (Vigna unguiculata (L.) Walp) in Sokoto Dry sub-humid zone of Nigeria
Locally and easily available rock phosphate could be a sustainable source of phosphorus for legumes production in this region where phosphorus deficiency has been identified as the major problem to crop production. As such, a field experiment was conducted during the 2011 cropping season at the Botanical Garden of the Department of Biological Sciences, Usmanu Danfodiyo University, Sokoto to evaluate the response of forage cowpea to partial replacement of organic fertilizer with Sokoto phosphate rock in Sokoto Dry sub-humid zone of Nigeria. Treatments consisted of five sources of phosphorus (organic fertilizer (OF) 100%, Rock phosphate (RP) 100%, OF: RP 50:50, OF: RP 75:25 and OF: RP 25:75) alongside with a control where no fertilizer was applied. The treatments were laid out in a completely randomized design (CRD) replicated three (3) times. Data were collected on plant height, leaf number, fresh and dry weights. Results obtained revealed significant effect of phosphorus sources on plant height, leaf number, fresh weight and dry weight. Plant height was higher in 100% OF and number of leaves per plant was higher in OF 100% and OF: RP 75:25 combination. Fresh weight and dry weight were higher in organic fertilizer (OF) 100%, OF: RP 75:50 and OF: RP 50:50. Thus, from the findings of this study, it could be concluded that organic fertilizer could be replaced with up to 50 % RP on P2O5 basis without significant reduction in the performance of forage cowpea.
Keywords: Dry sub-humid; forage cowpea; organic fertilizer; phosphate rock