Aliyu, A., Madukwe, D. K. ., Meka, I. N. ., & Ojeniyi, K. A. . (2026). Effect of triple superphosphate (TSP) fertilizer rates on cowpea growth and yield under irrigation: a case of lowland area, Sokoto state, Nigeria. Journal of Current Opinion in Crop Science, 7(1), 20–33. https://doi.org/10.62773/jcocs.v7i1.372