WEED CONTROL IN DIRECT SEEDED LOW LAND RICE

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dc.contributor.advisorRavi Kumar, A.
dc.contributor.authorSuresh Reddy, K.
dc.date.accessioned2018-06-19T05:11:28Z
dc.date.available2018-06-19T05:11:28Z
dc.date.issued2000
dc.description.abstractAn experiment entitled “Weed Control in direct seeded low land rice" was conducted on sandy clay loam soils of agricultural College Farm. Bapatla during ‘Kharif, 1999. The experiment was laid out in a Randomised Block design with eleven treatments replicated thrice. The treatment consisted of butachlor @ 2.0 kg a.i. ha“, butachlor + 2. 4-DEE @ 1.5 kg + 0.4 kg a.i. ha", pretilachlor@ 1.0 kg a.i. ha“, pretilachlor + 2, 4-DEE @ 0.75 kg + 0.4 kg a.i. ha", oxadiazon @ 0.5 kg a.i. ha", oxadiazon + 2, 4—DEE @ 0.3 kg + 0.4 kg a.i. ha“. thiobencarb @ 2.0 kg a.i. ha'l, thiobencarb + 2. 4-DEE @ 1.5 kg + 0.4 kg a.i. ha“, hand weeding at 20 and 40 DAS, weed free check, unweeded check. Sedges dominated the weed flora and accounted for 44.1 per cent, followed by broad leaf weeds (35.0 per cent) and grasses (20.9 per cent). Among the treatments, hand weeding at 20 and 40 DAS, followed~ by thiobencarb + 2, 4-DEE were most effective in reducing the density and drymatter production of total weeds and improving the weed control efficiency compared to other treatments. Among the herbicide treatments, herbicide combinations were more effecient in significantly reducing the weed densities and drymatter production by weeds, compared to their respective herbicide treatment. All the herbicide treatments significantly improved the plant height, total number of tillers m"" total drymatter production, leaf area index, effective tillers m'z, and grains per panicle as compared to unweeded control. The treatments hand weeding and oxadiazon 1+ 2, 4-DEE significantly reduced the weed competition and improved the grain yield of rice (4531 and 4500 kg ha", respectively) by about 92 and 91 per cent and straw yield (5625 and 5562 kg ha“, respectively) by about 91 and 90 per cent over unweeded check. Minimum nitrogen removal by weeds was achieved with pretilachlor + 2, 4-DEE followed by thiobencarb + 2, 4-DEE where as for P & K, minimum removal was recorded with hand weeding treatment followed by butachlor + 2, 4-DEE. However, the treatments, oxadiazon + 2, 4—DEE and hand weeding were equally effective in recording higher N, P and K uptake by crop. Butachlor + 2, 4-DEE resulted in highest additional net returns (Rs. 5635 ha"), followed by oxadiazon + 2, 4-DEE (Rs. 5580 ha"), however benefit-cost ratio was highest (6.???) with pretialchlor + 2, 4— DEE, followed by butachlor + 2, 4-DEE (6.44).en_US
dc.identifier.citationD6532en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810054030
dc.keywordsWEED CONTROL DIRECT SEEDED LOW LAND RICEen_US
dc.language.isoenen_US
dc.pages106pen_US
dc.publisherProfessor Jayashankar Telangana State Agricultural Universityen_US
dc.subAgronomyen_US
dc.subjectnullen_US
dc.themeAgronomyen_US
dc.these.typeM.Scen_US
dc.titleWEED CONTROL IN DIRECT SEEDED LOW LAND RICEen_US
dc.typeThesisen_US
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