MANAGEMENT OF Alternanthera spp. IN RICE (Oryza sativa) THROUGH DIFFERENT PRE AND POST EMERGENCE HERBICIDES
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Date
2020
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Indira Gandhi Krishi Vishwavidyalaya, Raipur (C.G.)
Abstract
The present investigation entitled “Management of Alternanthera spp. in rice (Oryza sativa) through different pre and post emergence herbicides” was conducted during the Kharif 2019 “at Research cum Instructional Farm, Indira Gandhi Krishi Vishwavidyalaya, Raipur,” Chhattisgarh. The experiment was consisted ten treatments and replicated three times in randomized block design (RBD) viz. pretilachlor 750 g/ha, bispyribac Na 25 gram per hactare, fenoxaprop-p-ethyl 56.25 gram per hactare, cyhalofop-butyl 80 gram per hactare, penoxsulam 1.02 + cyhalofop butyl 5.1, 135 gram per hactare, penoxsulam 22.5 gram per hactare, metsulfuronmethyl 4 gram per hactare, 4-D ethyl Ester 750 gram per hactare, weed free (HW) at 20, 40 and 60 days after sowing and weedy check. The test rice variety was “Indira Rajeshwari (IGKV R 1)” was line sown with 20 cm distance of a row to row on 8th July, 2019 and harvested on 17th November, 2019.”
The results of experiment revealed that highest value of growth parameters of rice and yield attributed were significantly observed in the 3HW treatment, among the weed management treatments. The application of penoxsulam+cyhalofop –butyl 135 gram per hactare, penoxsulam 22.5 gram per hactare and bispyribac Na 25 gram per hactare, 2,4-D ethyl 750 gram per hactare, metsulfuronmethyl 4 gram per hactare “increased the grain yield of rice” and significantly over the weedy check. “The effects of the treatment remained non-significant in plant population, test weight and harvest index. Among the herbicides, the application of penoxsulam+cyhalofop-butyl 135 gram per hectare allowed the lowest weed density, relative weed density, weed dry matter, weed index. The weed control efficiency was also highest under the application of penoxsulam+cyhalop 135 gram per hactare which was at par with the weed free treatment.”
The most dominant weed in experimental field was Alternanthera sessilis based on the weed data collected on different growth species. The maximum net return was noted under penoxsulam + cyhalofop-butyl 135 g/ha followed by penoxsulam 22.5 gram per hactare, bispyribac Na 25 gram per hactare and 2,4-D ethyl ester 750 gram per hactare and the minimum net return under weedy check treatment. The highest B:C ratio was observed under the application of under penoxsulam 22.5 g gram per hactare and bispyribac Na 25 gram per hactare followed by penoxsulam+cyhalofop–butyl 135 gram per hactare.
Description
MANAGEMENT OF Alternanthera spp. IN RICE (Oryza sativa) THROUGH DIFFERENT PRE AND POST EMERGENCE HERBICIDES