Evaluation of physiological and biochemical parameters of rice (Oryza sativa L.) genotypes under different nitrogen doses
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Date
2017-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Rice is the oldest domesticated grain and serves as a staple food for almost 50% of the world’s population. As the population increases day by day, the demand for food crops also increase. Nitrogen is the key nutrient element limiting the yield of rice. Use of nitrogenous fertilizers by the farmers to enhance yield is the major concern of today because of the excessive use of these fertilizers has led to bad impact on the crops as well as the environment. Nitrogen deficiency in soil is also be problematri. The present investigation was carried out to evaluate the effect of different nitrogen doses (N0, N50 and N100) on physiological and biochemical parameters of 12 genotypes of rice namely RNUE 1 (Vardhan
× BPT 5204/6), RNUE 2 (Vardhan × BPT 5204/10), RNUE 3 (Sampada × Jaya/2), RNUE 4 (Sampada × Jaya/3), RNUE 5 (Vardhan ×MTU 1010/2), RNUE 6 (Rasi × Jaya/2), RNUE 7 (Vardhan), RNUE 8 (BPT-5204), RNUE 9 (Sampada), RNUE 10 (Jaya), RNUE 11 (MTU 1010) and RNUE 12 (Rasi) which was conducted during the Kharief season of 2016. On increasing the nitrogen dose, physiological parameters such as, plant height, tiller numbers, LAI, flag leaf length & width, spikelet number & grain number, panicle weight & number, shoot weight, TDM, 1000 grain weight, economic and biological yield were enhanced with increasing nitrogen doses when compared with control. The biochemical parameter such as
chlorophyll content, NR activity (in leaves) protein (in seeds) of different genotypes were also found to be increased with increasing concentration of nitrogen. Among all the genotypes maximum economic yield was observed in RNUE 10 (Jaya) under N50 and RNUE 4 (Sampada × Jaya/3) under N100 dose However, RNUE 10 (Jaya) was found to be the most nitrogen use efficient genotype.
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