Shankhdhar, S.C.Das, Sudeshna2018-04-192018-04-192016-06http://krishikosh.egranth.ac.in/handle/1/5810044140Rice is one of the most important agricultural crops which serve as a staple food crop for almost 50% of the people existing in the world. As the population continues to expand, the demand for food crops also continues to increase. Injudicious use of nitrogenous fertilizers by the farmers in order to increase the yield has led to a detrimental impact on the crop as well as the environment. A field experiment was conducted during the kharief season of 2015 to evaluate the responses of different nitrogen doses (N0, N50 and N100) on the various morphological characteristics (plant height, harvest index, yield, chlorophyll and nitrogen content), yield attributes and grain quality in six genotypes namely NBTPP-1 (Varadhan X BPT5204/6), NBTPP-4 (Sampada X Jaya/3), NBTPP-6 (Rasi X Jaya/2), NBTPL-1 (Varadhan), NBTPL-3 (Sampada) and NBTPL-5 (MTU-1001) were observed. Maximum plant height at tillering was recorded for NBTPL-5 (55.56 cm) at N100 level and minimum height was observed for NBTPL-3 (38.22 cm) at N0 level. Maximum height at flowering was observed for NBTPL-5 (139.11 cm) at N100 level and minimum height was observed for NBTPP-6 (85.22 cm) at N0 level. Maximum harvest index was observed for NBTPL-1 (45.35 %) at N50 level and minimum harvest index was observed for NBTPL-5 (30.99 %) at N0 level. Yield and chlorophyll content was found to be highest at N100 and lowest for N0. Nitrogen content was highest for NBTPP-1 (1.53 %) at N100 level and minimum for NBTPP-6 (1.30 %) at N0 level. Silicon and amylose content was found to have a decreasing trend with increasing level of nitrogen. NBTPL-5 was found to perform better in N50 level of nitrogen dose. NBTPP-4 had the maximum grain yield and thus can be suggested for the N100 level.ennullThesis