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Thirty six crosses generated in diallel fashion from nine boro rice parental lines were evaluated to study the heterosis for yield and various yield related traits in rice (Oryza sativa L.) over three seasons i.e. Boro-2014, Kharif-2015 and Boro-2015. The findings suggested that the magnitude of heterosis differed from trait to trait and cross to cross over seasons. For yield per plant, standard heterosis ranged from -57.07% (HUR 36 x MTU 1010) to 34.60% (Jaya x Gautam) in boro-2014, -50.05% (HUR 36 x Gautam) to 39.66% (Krishna Hamsa x Gautam) in boro-2015 and -30.57% (IR 8 x IR 36) to 30.82% (IR 64 x Jaya) in kharif-2015. Jaya x Krishna Hamsa showed consistently significant standard heterosis over the three seasons i.e. 24.47% in boro-2014, 24.14% in boro-2015 and 28.50% in kharif-2015. Theses crosses may further be tested on larger scale for commercial exploitation.

Key words: Boro rice, Heterobeltiosis, Standard heterosis, Yield.