Correlation and path coeffecient analysis in rice (Oryza sativa L.)

Abstract

Genetic variability was studied for yield and yield related traits in 25 rice hybrids. The experimental materials had considerable amount of variability for all the traits. Out of the total hybrids evaluated, 5 were from public sector and 16 were from private sector. The hybrids NS-6508, LP-17201, RH-150025, US-314 and RH-131419, gave high yields of 8.3q/ha,7.9q/ha,7.26q/ha,7.1q/ha and 7.73q/ha respectively. GCV values for days to fifty percent flowering, plant height and yield are 8.39, 8.36 and 22.57 respectively. PCV values for days to fifty percent flowering, plant height and yield are 8.86, 8.00 and31.65 respectively. Heritability for days to fifty percent flowering is as high as 0.897and heritability for yield is moderate (0.508).Whereas, heritability for plant height is low (0.247). Studies on correlation in rice revealed that a character day to fifty percent flowering was positively associated and plant height was negatively associated with grain yield. Days to fifty percent flowering showed positive correlation (0.285) with yield per hectare which is significant at both 5% and 1% while plant height and panicle per metre square showed negative correlation of -0.129 and -0.992 respectively with yield per hectare. Days to fifty percent flowering and plant height were positively correlated. Path analysis revealed that days to fifty percent flowering has positive direct effect (0.360) on yield whereas plant height and panicle per metre square has negative direct effects (-0.171) and (-0.173) on yield respectively.