EFFECT OF WEEDING REGIME ON THE PERFORMANCE OF TRANSPLANT AMAN RICE VARIETIES

An experiment was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from June to December,2013 with a view to finding out the effect of weeding regime on the performance of transplant aman rice varieties. Four transplant aman rice varieties, viz., BR11, BRRI dhan39, BRRI dhan56 and Binadhan-7 and four different weeding regime treatments namely no weeding hand weeding at 20 DAT& 35 DAT, Herbicide manage and Herbicide + one hand weeding at 35 DAT were evaluated. The experiment was laid out in a randomized complete block design (RCBD) with three replications. Weed population were significantly affected by variety and weeding regimes. Among the varieties, BR11 produced the highest grain yield (4.42 t ha^-1) and BRRI dhan56 yielded the lowest (2.33 t ha^-1).The highest grain yield is due to the cumulative effect of number of effective tillers hill^-1 (6.24) and grains panicle^-1 (121).