Mashat, I.M.Ajayi, F.A.Ibrahim, A.J.Mwoltit, A.D.Jibrin, Mangwa I.2023-12-112023-12-112021-10-25https://keffi.nsuk.edu.ng/handle/20.500.14448/2159An experiments was conducted at the teaching and research farm of Faculty of Agriculture Shabu-Lafia campus (08°,33IN and 08°, 32!E), Nasarawa State Unversity Keffi, during the wet seasons of 2018 and 2019 to study the influence of halosulfuron herbicide on the growth and yield of three varieties of cowpea. The experiment consisted of two improved varieties (Fuampeal, Fuampea2) and one local (40days) variety and halosulfuron herbicide (applying once and zero application). The six treatment combinations with three replications were laid in a Complete Randomized Block Design. Data were collected on growth parameters such as plant height and number of branches and yield parameters such as 100 seeds weight, grain yield, total biological yield, haulms weight, and harvest index. Analysis was carried out using Genstat statistical package. The results obtained showed that cowpea Fuampea2 produced significantly (P<0.05) higher growth and yield values than cowpea Fuampeal and the local variety evaluated. The results also indicated that plots treated with halosulfuron herbicide recorded significantly (P<0.05) higher values in all the growth and yield parameters measured than the zero herbicide application in both cropping seasons respectively. This study therefore recommended Fuampea2 variety and the use of post-emergence herlosulfuron herbicide to cowpea growers in Lafia, Nasarawa State for maximum productivity.enCowpea, halosulfuron herbicide, variety, weedsOther