Impacts of tillage operations and microirrigation practices on weed infestation of brri dhan 28

Abstract

An experiment was conducted with BRRI dhan 28 following four irrigation
treatments (flood, drip, alternate wetting and drying, sprinkler) and two tillage
methods (conventional or puddled and unpuddled). Highest number of weed
infestation over conventional tillage was observed when herbicide was not
applied. Weed biomass was recorded maximum in sprinkler irrigation followed
by alternate wetting and drying (AWD) and flood irrigation. The main type of
weed in the rice field was sedges. Weed infestation at 20 and 40 days after
herbicide application was found to be the highest due to sprinkler irrigation over
AWD and flood irrigations. Unpuddled tillage showed lower weed number and
biomass over the conventional puddle tillage.