Fifty-two chickpea genotypes of segregating generations of AICRP centers were sown at three different soil temperatures i.e. 24.50C, 21.50C and 18.50C in randomized block design with two replications to determine the extent of variation in photo-thermal requirement of phenological duration in chickpea. Highly significant mean squares due to genotypes were observed for all the characters except PTI of flowering duration and biological yield/pt (significant at 5% probability leaves only) in E-I (24.50C soil temperature). The highly significant variances clearly indicate the presence of considerable amount of genetic variability in the studied genotypes. Growing degree-days and Heliothermal unit of podding and seed filling duration although had high heritability but at low genetic advance, suggesting the predominance of non-additive gene action for the expression of these characters. Thus these traits cannot be improved by simple selection method but can be exploited by heterotic breeding programme.