Almost complete and uniform grain sterility in rice over large areas has become a serious
problem in the warm and humid lowland region in Sri Lanka. In view of this, the influence of
high temperature at low and very high relative humidity (RH) levels and normal temperature
at very low and normal RH levels on the spikelet surface temperature and grain sterility in
rice at heading were studied under controlled environments. Almost complete grain sterility
in rice was induced by high temperature (35OC day/30 C night) when coupled with high RH …