Optimizing NPK Fertilizer Use to Improve Yield and Protein Content of Cowpea [Vigna unguiculata (L.) Walp]: A Review
Cowpea (Vigna unguiculata L. Walp) is considered an important source of dietary protein for rural and urban populations in sub-Saharan Africa. Its ability to fix atmospheric nitrogen in the soil further emphasizes its important role in improving soil fertility. However, low yield and poor seed quality are the consequen...