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Characterization and Evaluation of Rice (Oryza sativa L.) Genotypes in Randomized Complete Block Design

To characterize, compare and evaluate rice yields and its attributing traits, two-season experimental trials were conducted in a randomized complete block design with a standard check Pant Dhan-4 in 2016 and 2017, respectively. The tested genotypes were statistically significant (p<0.05) based on traits such as days to flowering, days to maturity, number of effective tillers, panicle length, fertile and sterile grain number per plant and yield. The average grain yield of rice genotypes transplanted in 2016 (10153.85 kg/ha) was higher than 2017 (5598.38 kg/ha). The minimum night temperature during grain filling period in Kharif 2016 was lower than 2017 by as much as 3.410C and we conclude that the elevated night temperature was detrimental to rice productivity. The yield increment in 2016 might be due to favourable weather conditions and ideal night temperature during the crop growth and development phase. The findings confirm that climate variables have significant effects on yields but these effects vary among rice genotypes. The results also reveal that the Pantnagar crop is severely affected by extreme temperature. Only four genotypes were found completely resistant to bacterial leaf blight during both years of the experiment. The resistant genotypes showing promising yields were selected for further evaluation.