Weed management in direct seeded unpuddled rice (Oryza sativa L.) under different sowing dates
2009
Jitendra Kumar | Singh, Dheer
Highest grain yield (2488.9 kg ha-1 during 2006 and 2703.3 kg ha-1 during 2007) was recorded from 20 June sown rice crop which was significantly higher over rest two dates of sowing (05 June and 05 July). Pendimethalin @ 1.0 kg ha-1 + anilophos @ 0.4 kg ha-1 (pre-emergence) produced significantly higher grain yield (3096.7 kg ha-1 during 2006 and 3289 kg ha-1 during 2007) over rest of the treatments. Due to less number and dry matter of weeds resulting in better crop growth, reflecting in higher number of panicles per metre row length, grains per panicle and 1000-grain weight. The grain yield was highest in mechanical two weedings at 20 and 40 DAS (3323 kg ha-1 during 2006 and 3437 kg ha-1 during 2007) being significantly superior over rest of the treatments. Reduction in grain yield of rice due to uncontrolled weeds in weedy plots was recorded 70.4 per cent during 2006 and 67.4 per cent during 2007. Echinochloa colonum among grasses and Commelina benghalensis, Caesulia axillaris among non-grasses and Cyperus rotundus among sedges were the predominant weed species in the experimental plot.
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