Effects of integrated weed management practices on the performance of boro rice cultivars

Abstract

An experiment was conducted during the period from November 2016 through May 2017 to evaluate the effect of integrated weed management practices on weed suppression and on the performance of boro rice cultivars. The experiment consisted of two cultivars viz., BRRI dhan28 and BRRI dhan29 along with eight different weed management practices. Cultivar did not exert any significant effect on weed density and dry weight. Integrated weed management practices exerted significant effect on weed density and dry weight. The highest weed dry weight was observed in no weeding treatment and lowest one was recorded in application of pre-emergence herbicide followed by one hand weeding at 35 DAT. BRRI dhan28 × no weeding treatment produced the highest weed dry weight and BRRI dhan28 × application of pre-emergence herbicide followed by one HW produced the lowest weed dry weight at different DATs. BRRI dhan28 produced higher grain and straw yields than BRRI dhan29. The highest grain yield was obtained from application of pre-emergence herbicide followed by one hand weeding at 35 DAT. BRRI dhan28 × application of pre-emergence herbicide followed by one HW at 35 DAT produced the highest grain yield and the lowest grain yield was resulted from BRRI dhan28 × no weeding treatment. From the study it may be concluded that BRRI dhan28 × application of pre-emergence herbicide followed by one HW at 35 DAT may be recommended for controlling weeds effectively and for getting the highest grain yield in boro rice.