[Effects of nighttime temperature increase at different growth stages on double season rice grain yield].

Two experimental glass-houses were utilized to study the effects of nighttime temperature increase (NTI) at different growth stages on the grain yield of double season rice. The NTI from the stage of sowing to panicle differentiation (primary branch differentiation) improved the tillering of rice, and increased the effective panicles. An average 1 degrees C rise in the minimum nighttime temperature (MNT) at this stage increased the grain yield of early and late rice by 10.