Abstract This project work was aimed at investigating the effect of pre-emergence and post-emergence herbicide application on the shoot biomass of two cowpea varieties in Minna, Nigeria. The field experiment was conducted at the Federal University of Technology, Minna, which lies within the southern Guinea Savanna of Nigeria. Two cowpea varieties (SAMPEA-8/IT93K-4521-1 and SAMPEA-16/IT07K-292-10) were used for the trial and were obtained from the Institute for Agricultural Research, Samaru Ah...
