Bio-efficacy of Acetochlor 50% EC against Weed Suppression in

Abstract

Field experiments were conducted at Bangladesh Rice Research Institute (BRRI), Gazipur in Aus, 2010 and BRRI Rangpur, during Boro 2011 to evaluate the performance of Acetochlor 50% EC for weed suppression, to find out an appropriate dose of the herbicide and its impacts on transplanted rice. Acetochlor 50%EC @ 200, 250 and 300 ml ha^-1 were applied. Pretilachlor 50% EC @ 1L ha^-1, weed free and unweeded control was used for comparison. The most dominant weeds were Cyperus diffornis, Monochoria vaginalis and Echinochloa crus-galli in year 1 and Cyperus diffornis and Echinochloa crus-galli in year 2. Cyperus diffornis was at the higher rank of dominant in both years. Application of Acetochlor 50%EC @ 250 ml gave more than 80% weed control efficiency, lower number and dry weight of weeds which ultimately resulted in higher yield attributes and grain yield of transplanted rice that were comparable to the standard in both seasons.

DOI: http://dx.doi.org/10.3329/jesnr.v4i2.10137  

J. Environ. Sci. & Natural Resources, 4(2): 73-77, 2011