This study was carried out to ascertain the species of weeds at Ramat Polytechnic Teaching and Research Farm, Maiduguri Borno State Nigeria. The objective of the study is to identify the weeds flora and ethnobotanical benefits of these weeds. Weed flora shows that 38 weed species were identified belonging to 18 different families out of which mostly, twenty-six ( 26) are annuals the remaining ( 8) are perennials. The distribution of these weeds further shows that Cleome gynandra L., Commelina

Field experiment was conducted at the University of Maiduguri Teaching and Research Farm in the Sudano Sahelian region of Nigeria during the 2018 and 2019 rainy seasons on the performance of Kenaf grown under two pre-emergence herbicides. The experiment consisted of 11 treatments from two pre-emergence herbicides of Butachlor and Pendimethalin each at the rate of 0.5, 1.0, 1.5, 2.0, 2.5 Kg a.i./ha and weedy check laid out on a Strip-plot Design in a Randomized Completely Block Design (RCBD) with 3 replicates. Parameters measured were crop injury score 1-9, number of leaves-plant, plant height, fibre yield, weed dry matter and weed control efficiency. The result revealed that Pendimethalin at 2.0-2.5 Kg a.i./ha and Butachlor at 2.5 Kg a.i./ha were most injurious to kanaf plants. Growth parameters such as the number of leaves per plant and plant height were best at Butachlor at 1.5 Kg a.i./ha. Fibre yield was best at Butachlor at 1.5-2.0 Kg a.i./ha. Pendimthalin at 2.0-2.5 Kg a.i./ha and weedy check have recorded higher Weed dry matter and Butachlor at higher rate 1.5-2.5 Kg a.i./ha efficiently controlled weeds 80-89%.