水稻是一种对气温反应很敏感的作物。特别是早稻与气温的关系尤其密切。它的生长发育,从播种到收获,必须达到一定的“积温”(注)才能成熟。早稻品种有早、中、迟熟之别,全生育期有长、短之分,就是因为它们对总的积温要求不同的缘故。举例说:从播种起,早熟品种农垦8号,累计温度达到2100℃左右时,便会成熟;迟熟品种珍珠矮,累计温度要达到2850℃左右时,才能成熟。 Rice is a crop that is sensitive to temperature. In particular, the relationship between early rice and temperature is particularly close. Its growth and development, from sowing to harvest, must reach a certain “accumulated temperature” (Note) to mature. Early rice varieties have early, middle and late maturity, the whole growth period has a long, short points, it is because of their total temperature requirements for different reasons. For example: From sowing, the early maturing cultivar Nongken 8, the cumulative temperature reached about 2100 ℃, it will mature; late varieties of pearls short, the cumulative temperature to reach about 2850 ℃, to mature.