The field experiment was conducted during kharif season 2013 and 2014 at C S Azad University of Agriculture and Technology, Kanpur, Uttar Pradesh to assess the performance of four rice establishment techniques and four weed control measures on weed dynamics, weed control efficiency, productivity and profitability of rice. Weed dynamics were higher in direct seeded rice (DSR) as compared to transplanted rice (TPR). The highest total weed density (214-282 plants/m2) and total weed biomass (40.5-52.2 g/m2) were recorded in DSR while the lowest in TPR. The efficacy of Sesbania brown manuring was significantly higher in both DSR and TPR. Compared with the weedy plots, two hand weeding at 20 DAS/DAT and 45 DAS/DAT followed by Bispyribac sodium 25 g/ha + (Chlorimuron + metsulfuron) 4 g/ha followed by one hand weeding at 45 DAS/DAT provided significant weed control. In both seasons, weed control efficacy was better in DSR and TPR. Across the weed control measures, the mean weed control efficiency ranged from 59.8 -98.6% and 64.2-98.5% at 30 DAS and maturity stage, respectively. TPR produced the maximum rice grain yields. On an average of both years, weed control treatments produced 21 to 43% higher rice grain yield than the weedy plots.
The present study consisted of five land configurations as main plot treatments viz., broadcasting, flat sowing, flat followed by earthing, narrow bed and furrow and broad bed and furrow and four nutrient management practices as sub plot treatments viz., basal dose of NPK + top dressing of N in two splits, basal dose of NPK + foliar spray of N in two splits, basal dose of NPK + N through LCC and basal doses of P and K + N through LCC only, and was laid out in split plot design and replicated thrice. The soil of experimental site was sandy loam in texture, low in organic carbon and available nitrogen, medium in available phosphorous and potassium. The hybrid variety (DKC9144) was sown as per treatment in plant geometry (50×25cm) maintained by thinning. The present investigation revealed that the seed sown in broad bed and furrow accumulated significantly highest nitrogen (grain 1.42% and stover 0.60%), phosphorus (grain 0.33% and stover 0.17%) and potassium (grain 0.38% and stover 1.10%) contents and uptake of these nutrients was also maximum in the same treatment i.e., nitrogen (grain 98.3 and stover 76.5 kg ha -1 ), phosphorus (grain 42.0 and stover 21.4 kg ha -1 ) and potassium (grain 26.5 and stover 140.8 kg ha -1 ) in pooled analysis. Hybrid maize accumulation significantly higher through basal dose of NPK + N through LCC nutrient content when fertilizer nitrogen (grain 1.42% and stover 0.60%), phosphorus (grain 0.33% and stover 0.17%) and potassium (grain 0.38% and stover 1.10%) there by uptake in grain and stover was also higher nitrogen (grain 95.9 and stover 75.3 kg ha -1 ), phosphorus (grain 41.3 and stover 21.1 kg ha -1 ) and potassium (grain 25.8 and stover 138.4 kg ha -1 ) in pooled analysis. Maximum improvement in available status of nitrogen (305.0 kg ha -1 ), phosphorous (18.9 kg ha -1 ) and potassium (244.0 kg ha -1 ) was recorded with broad bed and furrow method followed by narrow bed and furrow system and minimum at broad casting systems over its initial values. In nutrient management system highest increase in available status of N, P and K was recorded in basal dose of NPK + N through LCC followed by basal dose of P and K + N through LCC only over its initial values.
Aim: Comparative evaluation of various rice and maize based cropping sequences and assessment of their productivity. Study Design: Descriptive statistics was used and each treatment was replicated quadruple times using randomized block design.
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