EFFICACY OF PYRAZOSULFURON-ETHYL IN CONTROLLING WEEDS IN TRANSPLANTED RICE
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Date
2018
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CSK Himachal Pradesh Krishi Vishvavidyalaya Palampur
Abstract
The experiment was conducted at the experimental farm of CSKHPKV, Palampur during kharif and rabi 2017 to evaluate the new herbicide pyrazosulfuron-ethyl for controlling weeds in transplanted rice. Ten treatments comprised of company released sample of pyrazosulfuron-ethyl at 10, 15, 20 & 30 g/ha, market sample of pyrazosulfuron-ethyl at 10 & 15 g/ha, bispyribac- sodium at 20 & 40 g/ha, hand weeding twice and weedy check were evaluated for weed control, yield and economics. The soil of the experimental field was silty clay loam in texture, acidic in reaction (5.5), medium in available N (242 kg/ha), medium in available P (21 kg/ha) and high in available K (330 kg/ha). Ammannia baccifera and Cyperus difformis were the major weeds constituting 35.6 and 16.6 per cent, respectively of the total weed flora in rice during kharif season. These were followed by Echinochloa colona (14.2%), Cyperus iria (12%) and Echinochloa crusgalli (7.1%). Herbicides have significantly reduced the count and dry weight of weeds. Results revealed that plant height, total number of effective tillers, functional leaves per plant, crop dry matter accumulation, panicle length, number of spikelets per panicle, spikelet fertility, grain and straw yield were significantly higher when herbicides were applied. Maximum weed control efficiency was recorded in hand weeding treatment. Abundance of weeds in weedy check lowered the grain yield of rice by 24 per cent over the best treatment. Highest benefit cost ratio was obtained from pyrazosulfuron-ethyl 20 g/ha. Both pyrazosulfuron-ethyl and bispyribac-sodium did not show any phytotoxic effect on transplanted rice and on succeeding wheat.
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