Open AccessDetermination of the Optimum Rate of N Fertilizers with Addition of Goat Manure for Production of Cowpea (Vigna unguiculata [L.] Walp)
Author(s) -
Devi Liana,
Heni Purnamawati,
Maya Melati,
Yudıwantı Wahyu
Publication year - 2019
Publication title -
journal of tropical crop science
Language(s) - English
Resource type - Journals
eISSN - 2356-0169
pISSN - 2356-0177
DOI - 10.29244/jtcs.6.02.121-128
Subject(s) - vigna , fertilizer , manure , agronomy , dry weight , randomized block design , point of delivery , yield (engineering) , mathematics , biology , metallurgy , materials science
Cowpea (Vigna unguiculata L. Walp) is one of the potential substitutes of soybean due to its similar nutritional content. This study aims to determine the optimum rate of N fertilizer for the production of cowpea, and to determine the effects of the interaction between N fertilizer rates and goat manure application on cowpea production. The experiment was organized in a split-plot with a complete randomized block design with three replications. The main plot was goat manure, i.e. 0 and 5 tons.ha-1; the sub-plot was nitrogen fertilizer with five rates (0, 50, 100, 150, and 200% of the recommended rate), i.e. 0, 22.5, 45, 67.5, and 90 kg N.ha-1. Application of N fertilizer reduced the 100-seed weight and slightly reduced cowpea yield and yield components. Application of goat manure increased seed dry weight per plant, number of pods per plant, dry pod weight per plant, seed dry weight per m2, productivity, 100-seed weight, and the harvest index. There was no significant interaction between goat manure and different rates of nitrogen in affecting cowpea growth.