The degree of rice grain chalkiness increased with increasing mean temperature and sunshine duration from the south to the north during the grain ripening stage.

• 就中，米粒白垩质之等级的试区变异方向与三试区稻谷粒充实发育期间外界之气温和累积日照时数之试区变化方向一致，呈由南而北依次遁增。