Yield and yield attributes of rice (Oryza sativa. L) genotypes at different nitrogen levels

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. As nitrogen constitutes about 70% of the atmospheric gases, atmospheric nitrogen can also be used up by the plants after reduction by soil microorganisms. Hence soil contains both forms of nitrogen, NH4 and NO3-. Both the forms of nitrogen are available in the soil as mobile form but the crop plants are able to exploit only 30-40% of the applied nitrogen. The concentration of nitrogen in rice crop has a very strong effect on the number of spikelets and the nitrogen top-dressing during the panicle development can strongly control the spikelets number. The relationship between the number of spikelets and the quantity of nitrogen absorption by the rice crop was not only related to panicle initiation stage but also to panicle development stage The present study was conducted during the Kharif season of 2018 to evaluate the effect of different doses of nitrogen (N0, N50 N 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, yield & yield attribute parameters increased. Highest grain yield was recorded in MTU 1010 under N100.