Effect of weed management practices on rice (Oryza sativa L.) under different modes of establishment
| dc.contributor.advisor | Singh, Dheer | |
| dc.contributor.author | Dubey, Rajiv | |
| dc.date.accessioned | 2016-07-09T14:45:30Z | |
| dc.date.available | 2016-07-09T14:45:30Z | |
| dc.date.issued | 2012-08 | |
| dc.description | Thesis-PhD | en_US |
| dc.description.abstract | A field experiment was carried out at N.E. Borlaug Crop Research Centre, G.B. Pant University of Agriculture & Technology, Pantnagar with an aim to find out the effect of various weed management practices on crop productivity, weed growth and economics under different rice establishment methods during 2010-11 to 2011-12. Total 16 treatments consisted with four weed management practices [pyrazosulfuron (3 DAS/DAT) + mechanical weeding (at 40 DAS/DAT), cono-weeder (twice- at 20 and 40 DAS/DAT), hand-weeding (twice- at 20 and 40 DAS/DAT) and weedy check] and four rice establishment methods [SRI method, transplanted rice (TPR), direct seeded rice (DSR-dry seeded) and wet seeded rice (WSR- sprouted)] were tested in strip plot design with three replication. Variety ‘NDR-359’ was transplanted/sown on June 6, 2010 and June 11, 2011. Recommended dose of N, P and K fertilizer (150:60:40 kg ha-1) was applied in which half of the nitrogen and full dose of phosphorus and potash was applied as basal and remaining nitrogen was top dressed in two equal splits i.e. at tillering and panicle initiation stages. Insecticide was applied as and when required. For controlling stem borer (Scirpophaga incertulas) and other insects, cartap hydrochloride 4 G @ 25 kg ha-1 was applied. The predominant weed-flora in the field was Echinochloa colona (29%), Leptochloa chinenensis (17 %), Echinochloa crus-galli (16 %), Fimbristylis miliacea (12 %), Cyperus iria (10 %), Alternanthera philoxeroides (6 %) and Ammania baccifera (4 %). Different weed management practices and rice establishment methods significantly influences the yield attributes (panciles m-2, grains/panicle, test weight and panicle length) of rice. The result revealed that SRI method excelled among all the four rice establishment methods with regard to productivity (4.49 and 4.70 t ha-1), total nutrient uptake (47.73 and 53.55 kg ha-1 N, 62.33 and 67.64 kg ha-1 P and 22.85 and 25.54 kg ha-1 K) net monetary returns (Rs. 33177 and 38797 /ha/yr) and benefit:cost ratio (2.45 and 2.79) during both the years (2010-11 and 2011-12). Among weed control methods, hand-weeding (twice- at 20 and 40 DAS/DAT) gave significantly higher grain yield (4.44 and 4.67 t ha-1) higher nutrient uptake (73.50 and 82.71 kg ha-1 N, 23.01 and 25.80 kg ha-1 P and 85.35 and 89.59 kg ha-1 K) with lower weed density and dry weight as well as higher weed control efficiency (93.30 and 92.82 %) during both the years. SRI method under pyrazosulfuron (3 DAS/DAT) + mechanical weeding (at 40DAS/DAT) and transplanted rice (TPR), direct seeded rice (DSR-dry seeded) and wet seeded rice (WSR- sprouted) under hand-weeding (twice- at 20 and 40 DAS/DAT) produced significantly higher grain yield and lower weed density and dry weight. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/68582 | |
| dc.language.iso | en | en_US |
| dc.publisher | G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand) | en_US |
| dc.sub | Agronomy | |
| dc.subject | weed control, crop production, rice, plant establishment, transplantation, npk fertilizers | en_US |
| dc.these.type | Ph.D | |
| dc.title | Effect of weed management practices on rice (Oryza sativa L.) under different modes of establishment | en_US |
| dc.type | Thesis | en_US |