Growth, yield and nutrient use efficiency of late sown rice under differential nutrient management
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Date
2019-09
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present study was undertaken to study the effect of differential nutrient management on growth, yield and nutrient use efficiency of rice genotypes under late sown condition. A field experiment was conducted during the rainy seasons of 2017 and 2018 at the Norman E. Borlaug Crop Research Centre GBPUA&T, Pantnagar, India. The experiment was laid out in a split plot design with four treatments as main plot and six rice genotypes viz. PR-113, PD-22, HKR-47, PD-24, NDR-359 and PD-19 as sub-plot and was replicated thrice under late sown condition. The treatments included 50% RDF (60:30:20 kg NPK ha-1), 100% RDF (120:60:40 kg NPK ha-1), 150% RDF (180:90:60 kg NPK ha-1) and 50%RDF+ FYM(5 t ha-1). Incremental doses of N, P and K (150%RDF) significantly improved the plant height, number of tillers, leaf growth parameters such as LAI, LAD, SLW, crop growth parameters such as CGR, RGR, NAR, leaf dry matter and shoot dry matter. Increase in CGR and RGR contributed to greater biomass production. Also the yield components such as number of panicles /m2, number of spikelets per panicle , filled grain %, increased significantly with increase in nutrient supply resulting in higher biological and grain yield. All the genotypes had increased nutrient content in plant as well as in leaf at flowering and maturity. Uptake of N, P and K by rice plant at harvest significantly increased at 150%RDF in response to nutrient supply. This ultimately resulted in increased grain yield with 150%RDF. PFP was not affected with increase in nutrient supply indicating that increasing the dose to 150%RDF increased the yield by 30-60% in all the genotypes without affecting the nutrient use efficiency at higher doses. When the dose was reduced to 50%RDF, the growth and yield parameters decreased significantly. Application of FYM along with 50% RDF could not result in yield levels comparable to 100% RDF.
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