Integrated weed control on rainfed lowland rice (Oryza sativa L.).
1988
Giri G.S.
A field study was conducted to determine the effect of butachlor [N-butoxymethyl-2-Chloro-2', 6'-diethylacetanilide] on weed population as it affects the growth and grain yield of lowland rainfed rice when applied alone or in combination with manual weeding using different seed rate/spacing. Ri-10 variety of rice was applied with a single dose of butachlor (1 kg ai/ha) 8 DAS/DAT alone or in combination with handweeding. The weed species predominantly present were Monochoria vaginalis (Burm. f.) Presl, Sphenoclea zealanica Gaertn., Ludwigia octovalvis (Jacq.) Raven, Ludwigia perennis L. Echinochloa colona (L.) Link, Echinochloa oryzoides (Ard.) Fritsch, Echinochloa crusgalli (L.) Beauv. spp hispidula (Retz.) Honda, Cynodon dactylon (L.) Pers., Cyperus iria L. Cyperus difformis L., Cyperus brevifolius (Rottb.) Massk. and Fimbristylis milliaceae (L.) Vahl. Two handweedings alone produced the highest grain yield of 5.93 and 5.95 ton/ha on wet seeded and transplanted rice culture, respectively. In wet-seeded rice, unweeded check at higher seed rate (225 kg/ha) produced yield comparable to the rest of weed control methods. This indicates the effectiveness of higher seed rate to suppress weeds effectively. In transplanted rice, the effect of weed control methods gave significantly higher yield than unweeded check. However, the yield obtained from butachlor alone treated plots were comparable to handweeded and butachlor plus handweeded treatments.
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