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Abstract
An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University
(BAU), Mymensingh during the period from July to December 2012 to find out the effect of herbicide
Prechlor 500 EC on weed control and performance of transplant aman rice. The experiment was laid out
in a randomized complete block design with four replications. The experiment consisted of two varieties
viz., BRRI dhan41 and Nizershail, and four levels of Prechlor @ 0, 0.5, 1.0 and 1.5 L ha-1. Monochoria
vaginalis, Nymphaea nouchali, Paspalum scrobiculatum, Echinochloa crusgalli and Scirpus juncodies
were the major weeds in the experimental plots. Prechlor 500EC @ 1.5 L ha-1 showed the best
performance in reducing weed density, weed dry weight and increased weed control efficiency but reduce
grain yield. Variety had significant influence on all the yield and yield contributing characters of rice.
Higher grain yield (3.09 t ha-1) was obtained from BRRI dhan41. Different levels of Prechlor also had
significant effect on yield and yield contributing characters such as number of total tillers hill-1, number of
effective tillers hill-1, panicle length, spikelets panicle-1, grains panicle-1, grain yield, straw yield and
harvest index. Prechlor @ 1.5 L ha-1 showed best performance with respect to most yield attributes, grain
and straw yields and the lowest grain yield was obtained from Prechlor @ 0 L ha-1. The interaction effects
of variety and herbicide Prechlor had significant effect on all yield attributes except plant height, effective
tillers hill-1, panicle length, 1000-grain weight and harvest index. The highest grain yield (3.62 t ha-1) was
obtained from variety BRRI dhan41 with Prechlor @ 1.5 L ha-1. The results suggest that farmers can be
advised to use herbicide Prechlor @ 1.5 L ha-1 to boost up the production of BRRI dhan41 controlling
weeds during aman season under the agro-climatic condition of the study area.