PLANT DENSITY AND WEED MANAGEMENT EFFECT ON THE PRODUCTIVITY OF DRUM SEEDED RICE (Oryza sativa. L)

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dc.contributor.advisorMUJEEB KHAN, M.D.
dc.contributor.authorSANDEEP NAYAK, B.N.
dc.date.accessioned2016-12-07T10:42:23Z
dc.date.available2016-12-07T10:42:23Z
dc.date.issued2014
dc.description.abstractA field experiment entitled “Plant density and weed management effect on the productivity of drum seeded rice (Oryza sativa L.)” was conducted at Agricultural College Farm, Bapatla on sandy loam soil during the kharif 2012. The treatments comprised of combination of five drum seeder spacings (20×7cm, 20×10.5cm, 20×14 cm, 20×17.5 cm, 20×24.5cm, and manual transplanting (20×15cm), with a plant density of 71, 47, 35, 28, 20 and 33 hills m-2, respectively and five weed management practices viz., weedy check (W1), hand weeding at 20 and 40 DAS (W2), cono weeding at 20 and 40 with modified cono weeder (W3), pre-emergence application of anilofos @ 0.375 kg a.i ha-1 followed by post-emergence application of 2, 4 D sodium salt @ 1.0 kg a.i ha-1 20-25 DAS (W4), pre-emergence application of pendimethalin @1.0 kg a.i ha-1 followed by post-emergence application of bispyribac sodium @ 20 g a.i ha-1 30 DAS ( W5). The designed adopted was strip-plot with three replications. The findings of the experiment revealed that the weed parameters viz., weed density, weed drymatter production, drymatter production, and agronomic parameters viz., tiller number, plant drymatter accumulation at all the stages of crop growth, days to 50 per cent flowering and days to maturity were significantly influenced due to plant densities and weed management practices xiii Among different plant densities, the highest density of 71 hills m-2 resulted in minimum weed density, weed drymatter, and more number of tillers m-2 and maximum drymatter production at all stages of plant growth. Early flowering and maturity was noticed with the plant density of 28 hills m-2. Among weed management practices, W3 (cono weeding) recorded lower weed density, weed drymatter, and highest number of tillers m-2 and maximum drymatter accumulation and delayed flowering and maturity. The yield attributes viz., productive tillers, total and filled grains per panicle, test weight, grain and straw yield, harvest index and nutrient uptake were significantly influenced due to different plant densities and weed management practices. The highest density of 47 hills m-2 resulted in higher productive tillers ,grain and straw yields, harvest index and nutrient (N, P and K) uptake, but the highest number of grains per panicle, panicle length and test-weight were observed with the lowest density (20 hills m-2). Among weed management practices, cono weeding twice (W3) was resulted in highest productive tillers, panicle length, number of grains per panicle, test weight, grain and straw yields, harvest index, and the nutrient (N, P and K) uptake. Among herbicides treatments pre-emergence pendimethalin followed by post-emergence application of bispyribac sodium (W5) found superior over the application of preemergence anilofos followed by post-emergence application of 2, 4.D (W4) on enhancing the yield attribute and grain yield. A significant interaction between rice plant densities and weed management practices showed that a treatment combination of D2×W3 gave the highest paddy yield of 4275 kg ha-1 which was significantly superior to all the treatment combination. Drum seeding with plant density of 47 hills m-2 (D2) found profitable compared with other plant densities. Among the drum seeding method, the maximum gross returns, were obtained from drum seeding with spacing D2 (47 hills m-2) integrated with cono weeding twice at 20 and 40 DAS (W3). But the highest net returns and returns per rupee invested were obtained with a combination of plant density 47 hills m-2 with pendimethalin followed by bispyribac sodium because of exclusion of labour cost and high efficacy of chemicals on weed control. From the present investigation, it can be concluded that, direct seeding by drum can be recommended with plant density of 47 hills m-2 integrated with pre-emergence application of pendimethalin followed by post-emergence application of bispyribac sodium (W5) to get optimum plant density and to reduce cost of cultivation. Despite of less gross returns from pre-emergence application of pendimethalin followed by postemergence application of bispyribac sodium (W5) the net returns and B:C ratio was recorded more hence it is the suitable effective herbicide combination in transplanted as well as direct seeded rice.en_US
dc.identifier.citation115p.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/89418
dc.language.isoen_USen_US
dc.publisherACHARYA N.G. RANGA AGRICULTURAL UNIVERSITYen_US
dc.relation.ispartofseriesD5052;
dc.subAgronomyen_US
dc.these.typeM.Sc
dc.titlePLANT DENSITY AND WEED MANAGEMENT EFFECT ON THE PRODUCTIVITY OF DRUM SEEDED RICE (Oryza sativa. L)en_US
dc.typeThesisen_US
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