Abstract:

To study the relation between the temperature of leaf (Tleaf) and yield, 12 variaties of double-cropping rice were measured for leaves temperature and yield by infrared radiation thermometer. These results showed that, the daily vatiation of Tleaf was a single peak curve, the variation range was less than the air temperature. The temperature differences between of air and leaves (TD) were appeared among different varieties in different growth stages. TD had a positive correlation with yield at 14:00 in different growth stages, the highest degree of correlation in heading. The daily average of Tleaf of flag leave had a negative correlation with yield in heading and 15 days after heading (early season rice) or 20 days (late season rice), the average of TD of flag leave had a positive correlation with yield.