Effects of Copper and Vermicompost on Growth and Yield of Cowpea (Vigna Unguiculata L.) Walp and Nutrient Accumulation in Its Fruits. J. Biodivers. Conserv. Bioresour. Manag. 2020, 5 (2), 13-18. https://doi.org/10.3329/jbcbm.v5i2.44910.