A. Aliyu, D. K. . Madukwe, I. N. . Meka, and K. A. . Ojeniyi, “Effect of triple superphosphate (TSP) fertilizer rates on cowpea growth and yield under irrigation: a case of lowland area, Sokoto state, Nigeria”, J. Current Opinion Crop Sci., vol. 7, no. 1, pp. 20–33, Mar. 2026.