Critical period of crop-weed competition in aerobic rice (Oryza sativa) under irrigated ecosystem
DOI:
https://doi.org/10.59797/ija.v63i2.5411Keywords:
Aerobic rice, Critical period of crop–weed competition, Weed density, Yield lossAbstract
A field experiment was conducted during rainy season of 2015 at Pantnagar, Uttarakhand, to find out the critical period of crop-weed competition in aerobic rice (Oryza sativa L.). Yield losses due to crop-weed competition were most pronounced during the period from 15 to 45 days after sowing (DAS) and were ranged from 4.8% to 76%. Rice yield continued to decline as the duration of weed-competition increased beyond 15 DAS, as there was drastic reduction in the number of panicles/m2 and grains/panicle that accounted for lower rice yield. Hence the period between 15 and 45 days in aerobic rice under irrigated situation is crucial to achieve 95% of maximum possible yield (weed free) of aerobic rice.
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