Mfeka, Nonkululeko, Reckson A. Mulidzi, and Francis B. Lewu. “Growth and Yield Parameters of Three Cowpea (Vigna Unguiculata L. Walp) Lines As Affected by Planting Date and Zinc Application Rate”. South African Journal of Science 115, no. 1/2 (January 30, 2019). Accessed December 22, 2024. https://sajs.co.za/article/view/4474.