Abstract
The horizontal distribution of leaf temperature in a rice population of 40×40 meters was investigated with an infrared scanning thermometer under a high temperature and high solar radiation during the period from late-July to late-August. The results obtained are summarized as follows: 1. Either the west wind blowing from a paved road toward the rice population or the east wind blowing across the field was the predominant wind direction in the examined rice population. These winds formed some belt-like low-temperature areas (rice plant waving) on the surface of the rice population. The leaf temperature in the cross section of the rice plant waving was the lowest at the middle of the rice plant waving and increased with distance from the middle. The temperature at the middle of the rice plant waving decreased gradually from windward to lee side in the case of the west wind, but did not vary in the case of the east wind. 2. In the case of the west wind, leaf temperature increased from the border to inside of the population at the wind speed of less than 1m/sec, but it decreased with the distance from the bordering area at the wind speed of more than 1m/sec. In the case of the east wind, the leaf temperature varied little in the rice population irrespective of the wind speed.
