Abstract:
This weed management investigation was carried out at the Zonal Agricultural Research
Station (ZARS), Bangalore, during the summers of 2017 and 2018 to standardize agrotechniques for weed management of rice grown under aerobic conditions. Te experiment was
laid out in a randomized complete block design with eleven treatments replicated thrice.
It consisted of two pre-emergence herbicides and one early post-emergence herbicide, the
stale seedbed technique, mulching, hand weeding and intercultivation which was compared
to the weedy check. Te results showed that pyrazosulfuron ethyl 10% wettable powder
(WP) at 35 active ingredient (a.i.) g ⋅ ha–1 as PE f bispyribac sodium 10% SC at 30 ml ⋅ ha–1
a.i. as an early post-emergence herbicide performed better in terms of rice grain and straw
yield (5,800 and 9,786 kg ⋅ ha–1, respectively), plant height (58.42 cm), rice total dry matter
production (149.84 g ⋅ plant–1), productive tillers ⋅ hill–1 (40.32), panicle length (24.53 cm),
1000 grain weight (25.35 g), net returns (Rs. 62424), higher B : C ratio (2.59) and lower total
weed density, weed dry weight at different stages of rice and weed index (3.80%) as well as
higher weed control efciency (90.52%). Tis practice could be recommended to farmers
growing aerobic rice under these climatic conditions.
