Studies on non-chemical weed management and planting geometry in dry direct seeded rice (Oryza sativa L.) cultivars.
| dc.contributor.advisor | Singh, Manoj Kumar | |
| dc.contributor.author | Nagargade, Mona | |
| dc.date.accessioned | 2019-08-05T11:23:45Z | |
| dc.date.available | 2019-08-05T11:23:45Z | |
| dc.date.issued | 2018 | |
| dc.description.abstract | Rice (Oryza sativa L.) is a food basket for more than 60 % of the world’s population and plays a crucial role in the economic and social stability of the world. India is the second largest producer of rice only after China. Globally rice is produced in 160.6 mha area with production of 490.3 mt during 2015-2016 (FAO, 2016). In India, area under cultivation of rice is around 44 m ha with production of 109.70 million tonnes during 2016-2017 (Anonymous, 2018).Increased production costs, labor shortages, increased wages, and decreased groundwater availability have resulted to switch over from traditional paddy nursery transplanting to dry direct seeding of rice in many Asian countries, including India (Mahajanet al., 2013).In direct-seeded systems, weeds are a major biotic stress to rice production as they increase production costs and cause yield loss.Herbicides are being widely used in direct seeded rice but, with the threat of herbicide resistance and environmental pollution(Holt, 2001), interest has increased in non-chemical weed management (cultural) practices like mechanical weeding, manual weeding, Sesbania co-culture and straw mulching.The present field experiment was conducted during kharif seasons of 2015-16 and 2016-17 at the Agricultural Research Farm, Department of Agronomy, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh. The experiment was laid out in split plot design consisting of 20 treatments. Two planting geometry and two cultivars were assigned to main plot and five non-chemical weed management methods were assigned in sub plots. The perusal of the data reveals that lower weed density, weed biomass, nutrient removal by weed and higher weed control efficiency was recorded in square planting, Arize 6444 cultivar and one hoeing at 12 DAS fb hand weeding at 30 DAS during both years. Number of tillers/m2, dry matter accumulation/running m and LAI recorded higher in seed drill sown crop at 30 DAS while at later stages it was higher in square planting treatment. Plant height was higher in square planting geometry at all the growth stages during both the years. Yield attributing characters, grain yield, straw yield and net returns were higher in square planting treatment during both years. Arize 6444 and one hoeing at 12 DAS fb hand weeding at 30 DAS treatment recorded higher value of growth attributes, yield attributes, grain and straw yield, net return and B:C ratio during both the years. Available nutrient (N, P and K) in soil after crop harvest was higher in seed drill sown crop .Organic carbon and available potassium was higher in one hoeing at 12 DAS fb straw mulching 6t/ha weed management treatment, while available N and P was higher in one hoeing at 12 DAS fbSesbania incorporated at 45 DAS during both the years. | en_US |
| dc.identifier.citation | Cultivar | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810119284 | |
| dc.keywords | Cultivar, Non-chemical weed management, Seed drill sown crop, Square planting | en_US |
| dc.language.iso | en | en_US |
| dc.pages | 158p. | en_US |
| dc.publisher | Department of Agronomy Institute of Agricultural Sciences, Banaras Hindu University, Varanasi | en_US |
| dc.sub | Agronomy | en_US |
| dc.subject | null | en_US |
| dc.theme | Cultivar | en_US |
| dc.these.type | Ph.D | en_US |
| dc.title | Studies on non-chemical weed management and planting geometry in dry direct seeded rice (Oryza sativa L.) cultivars. | en_US |
| dc.type | Thesis | en_US |