Kumar, NirajIzhar, Tajwar2017-08-112017-08-112008http://krishikosh.egranth.ac.in/handle/1/5810028527CORRELATION AND PATH ANALYSIS STUDIES IN HYBRID RICE (Oryza sativa L.)Rice is a staple food crop of India, providing 43% of calorie requirement for more than 70% of Indian population. India is the second largest country after China, wich has deployed hybrid rice technology on a commercial scale. According to preliminary estimates approximately 1.0 million ha rice area has been planted to hybrids, which is likely to add an additional 1 million tons of paddy rice to our food basket. The present investigation was conducted at crop Research Centre, Kanke, Ranchi under Birsa Agricultural University during Kharif 2007 under rainfed condition. The experimental design was RBD having three replications. The variability, correlation and path analysis studies were done in sixteen genotypes of rice including two high yielding varieties as checks for twelve quantitative characters and three diseases of rice. The analysis of variance revealed that there were significant differences among all the characters except number of productive tillers per plant which was significant only at 5 % level. The mean table revealed that the seven entries, viz. PHB-71, PA-27P77, PA-25P25, US-312, PA-6444, EURO-9 and NPH-207 were statistically superior to the best check, IR-64 in grain yield (q/ha) and were found at par with each other. The characters, viz. number of spikelets per panicle, number of filled grains per panicle, number of sterile spikelets per panicle, number of panicles per m2 and days to 50% flowering showed wide range of variability. The high values of phenotypic and genotypic coefficient of variations were observed for false smut, number of sterile spikelets per panicle and number of spikelets per panicle. High heritability accompanied with high genetic advance were found for the characters,viz. number of spikelets per panicle, number of sterile spikelets per panicle, number of filled grains per panicle and false smut. Correlation analysis revealed that grain yield (q/ha) was positively and highly significantly associated with days to 50% flowering, plant height, number of productive tillers per plant, number of panicles per m2, number of spikelets per panicle and number of filled grains per panicle, while negative and highly significant correlation was observed for thousand grain weight. Path coefficient analysis revealed that the characters, viz. days to 50% flowering, number of productive tillers per plant, number of panicles per m2, number of spikelets per panicle, false smut and brown spot had positive, direct effect towards grain yield while thousand grain weight showed negative direct effect. The result obtained in the present investigation indicated that the characters, viz. days to 50% flowering, number of productive tillers per plant, number of panicles per m2, number of spikelets per panicle and number of filled grains per panicle were yield contributing characters in hybrid rice and may be utilized for further selection. These characters were correlated positively and significantly with grain yield and also had high value of heritability, genetic advance and genetic advance as percent of mean. Out of the seven entries which were found statistically superior genotype, PHB-71 gave the highest yield potential (61.12 q/ha) along with less infestation of diseases.en-USnullThesis