关键词: 水稻, 垩白形成, 地域分异, 气象要素

Abstract: Based on the experiment with 19 rice varieties and different sowing dates at 13 locations in China, meteorologic ecological basis of rice chalkiness formation and the regionalization of meteorologic chalkiness in rice growing areas with different rice farming system have been analysed. Daily mean temperature in the period of 15 days after rice full heading stage is a leading factor affecting rice chalkiness, and from north to south the rice meteorologic chalkiness varies from small to large with the change of daily mean temperatare of 15 days after rice full heading; the rice growing areas of the meteorologlc chalkiness area of≤5% include areas on the north of the Sichuan Basin, areas on the north of the Huaihe River and areas of Yun-Gui High Plateau; those of 5%-10% include Sichuan Basin, areas in the south of Yunnan province and areas from the south of Huaihe River to along the south of Yangtse River; those of 10%-20% (only concerning early rice of double-cropping rice) include areas on the east of Yung-Gui High Plateau and on the south of Yangtse River.

Key words: Daily mean temperature, Chalkiness formation, Meteorological factor, Regionalization, Rice