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Performance of sixty F1 hybrids along with their 23 parents and three standard varieties was evaluated in a randomized complete block design with three replications during Sali, 2013. Significant variation was observed for parents, hybrids and hybrids versus parents for most of the yield and yield related characters. Grain yield exhibited mid parent heterosis varying from -88.7 (IR 79156A/IET 19916) to 151.5% (IR 58025A/Prafulla), heterobeltiosis from -91.9 (IR 79156A/IET 19916) to 128.2% (IR 58025A/Prafulla) and standard heterosis ranging from -91.3 to 56.5% over the late maturing check Ranjit, -86.2 to 148.3% over medium duration check TTB 404 and -91.9 to 44.4% over the hybrid check JKRH 401. Non-significant or negative heterosis for grain yield in most hybrids was attributed to spikelet sterility of varying magnitudes. Significant and desirable SCA effects for component characters resulted in significant SCA effect and heterosis for grain yield.

Magnitude of Heterosis for Yield and Its Components in Hybrid Rice (Oryza sativa L.)