Efficacy of Pre-emergence Herbicides and Integrate Them with Hand Weeding on Weed Control, Yield and Yield Components of Cowpea (Vigna unguiculata L.)

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In order to evaluate the efficacy of some Pre-emergence herbicides on weed control and increasing yield of cowpea, an experiment was conducted in the Barmgavmishi village, Haftkel city of Khuzestan province in 2011. Weed control treatments included the pre-emergence applications of Trifluralin (2 lit ha-1) + hand weeding, Pendimethaline (3 lit ha-1) + hand weeding, Imazethapyr (1 lit ha-1), Imazethapyr (1 lit ha-1) + hand weeding, Imazethapyr (1 lit ha-1) + Trifluralin (2 lit ha-1), Imazethapyr (1 lit ha-1) + Pendimethaline (3 lit ha-1) and finally a weed free and weed infested plot also were considered as control. The experimental design was randomized complete block with 8 treatments and 3 replications. The results showed that cowpea seed and biological yield and yield components were significantly affected by weed control treatments. Combined treatments of Imazethapyr + hand weeding, Pendimethaline + Imazethapyr, Imazethapyr, Trifluralin + Imazethapyr, and Pendimethaline + hand weeding effectively controlled weeds by 91, 89.5, 85.5, 83 and 75.4 %, respectively. Thus, the integrated treatments of Pendimethaline + Imazethapyr, Pendimethaline, Imazethapyr  and Trifluralin + hand weeding, were the best treatments for weed control and producing higher yield in cowpea under similar conditions to those in this experiment.
 

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