Sharma, Kishore K.Brahma, Thirangtha2024-04-032024-04-032021https://krishikosh.egranth.ac.in/handle/1/5810208096The research was carried out with ten Ahu genotypes (including two joha mutants). The objective of the study was to identify Ahu rice varieties with weed suppressing ability (WSA), determine genetic variability and determination of the component traits for weed suppressing ability. High PCV was observed for all the characters except field emergence, plant biomass at maturity, plant height at 20 DAS and 40 DAS, grains per panicle and 1000 grain weight. High GCV were observed for number of leaves at 60 DAS and maturity, leaf area, leaf angle, plant height at 60 DAS and maturity, plant biomass at 60 DAS, total plants/m2, total tillers/m2, ear bearing tillers and grain yield /m2. High heritability was observed for all the characters except number of leaves at 20 DAS. High genetic advance was observed for all the traits except panicle length and 1000 grain weight. Estimation of correlation coefficient revealed very strong positive association of grain yield with plant biomass at maturity, plant height at maturity, total plants/m2, total tillers/m2, ear bearing tillers, grains per panicle, 1000 gr. Wt. and weed suppressing ability. Moderately strong association was found with number of leaf at maturity. Negative association was observed with weed biomass at maturity, number of weeds, leaf angle and days to flowering. Strong positive association of weed suppressing ability was found with number of leaves at maturity, plant biomass at maturity, plant height at maturity, total plants/m2, ear bearing tillers and grains per panicle. Moderately strong association was found with leaf area and 1000- grain weight. Negative association was found with weed biomass, number of weeds, days to flowering and panicle length. Characters positively associated with weed suppressing ability: number of leaves at maturity, plant biomass at maturity, plant height at maturity, total plants/m2, ear bearing tillers/m2, grains per panicle, leaf area and 1000 grain weight. Characters with high heritability having positive correlation with weed suppressing ability are number of leaves, leaf area, plant biomass, plant height and total plants/ m2. From the research, it was concluded that the variety Inglongkiri exhibited the highest weed suppressing ability followed by Banglami, Meghi and Puthia.EnglishThesis