Growth, yield and grain quality of rice (Oryza sativa. L) at different nitrogen levels
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Date
2019-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Rice is one of the major food crops for more than 3.5 billion people. . Nitrogen plays a very important role in crop growth and it can limit yield potential of cereals. For pushing up the yield to maximum there is a need for better crop management practices. The present study was conducted during the Kharif season of 2018 to evaluate the effect of different doses of nitrogen (N0, N50&N100) on morphological, physiological, biochemical, agronomical parameters, yield and grain quality of 6 rice genotypes namely; RNUE 1 (BPT-5204), RNUE 2 (Jaya), RNUE 3 (MTU-1010), RNUE 4 (Rasi), RNUE 5 (Rasi × Jaya/2) and RNUE 6 (Sampada). On increasing doses of nitrogen, morphological parameters like plant height, tiller number, LAI, flag leaf length & width, yield & yield attribute parameters increased. Similarly, biochemical and
physiological parameters like chlorophyll content and NR activity in leaves, protein, and starch content in rice grains increased with increasing doses of nitrogen but amylose content decreased. However, Zn content increased at N50 but decreased at N100 in some genotypes. Agronomical parameters which include nitrogen content and NUE traits like agronomic nitrogen use efficiency, physiological nitrogen use efficiency, partial factor productivity of applied nitrogen, in rice grain decreased with increasing doses of nitrogen but apparent recovery efficiency of applied nitrogen increased in all rice genotypes. Highest grain yield was recorded in MTU 1010 under N100. Highest ANUE and PNUE were recorded in MTU 1010 and Rasi x Jaya/2 under N50. Highest PFPN and REN (%) were recorded in MTU 1010 under N50 and N100, respectively.
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