“Effects of Copper and Vermicompost on Growth and Yield of Cowpea (Vigna Unguiculata L.) Walp and Nutrient Accumulation in Its Fruits”. 2020. Journal of Biodiversity Conservation and Bioresource Management 5 (2): 13-18. https://doi.org/10.3329/jbcbm.v5i2.44910.