Assessment of Different Weed Control Methods on Growth and Yield Performance of T. Aus Rice

Abstract

An experiment was conducted in the Agriculture Field Laboratory, Noakhali Science and Technology University (NSTU) during the period of April-August 2019, for the assessment of different weed control methods on growth and yield performance of transplanting aus (early summer) rice. The experiment was carried out with four (4) weed control treatments viz. T1 = No weeding (control); T2 = Hand weeding at 15 and 30 DAT; T3 = Pre-emergence herbicide (Acetachlore 14% + Bensulfuron methyle 4%); T4 = Post-emergence herbicide (Pyrozosulfuran ethyle 10 %) using two aus varieties viz. BRRI dhan 83 and BRRI dhan 65. The experiment was carried out in a Randomized Complete Block Design with three replications. The result revealed pre-emergence herbicide (T3) as the most effective and efficient method of weed control by increasing yield significantly. No weeding caused 37.46 % loss of yield in this experiment where the application of pre-emergence herbicide showed 96.26 % higher yield than no weeding followed by hand weeding 79.14 % and post-emergence herbicide 64.70 %. Post-emergence herbicide performed well in tillers hill-1 along with straw yield. No weeding showed worst performance in every growth and yield attributes also it resembled as liable for maximum sterile grains panicle-1. Despite some offensive effects, no efficient alternative is currently available to shift the herbicidal weed control in aus rice as manual hand weeding is laborious and costly. Being efficient in controlling weeds, application of the pre-emergence herbicide may be used for effective weed control in aus rice.