Effect of growth environments on physiological parameters of rice hybrids during dry season

A field experiment was conducted to find out the effect of two planting dates on nine rice hybrids during dry season of 2001. 15^th February planted crop had longer (7.8 days) growth duration but it was superior in terms of LAI, CGR and light interception with the advancement of crop growth than 28^th February planting. Average cultivar GDD from sowing to four leaf, flowering and maturity were 188, 1613 and 2174, respectively. Among rice hybrids, KRH 2 appeared as most promising due to having medium duration (140.5 days), moderate canopy architecture (k = 0.50 − 0.58) and maximum LAI (4.02) as well as CGR (22.87 g/m²/day) at midphase of growth.