Ossai, C., Akpeji, S. C., Oroghe , O. E. . and Olorode, E. M. . (2021) “Optimizing the plant spacing for the maximum yield of pigeon pea monoculture in Delta State of Nigeria ”, Journal of Current Opinion in Crop Science, 2(3), pp. 340–346. doi: 10.62773/jcocs.v2i3.78.