冷害对北方稻区危害极大,其中延迟型冷害居多,受害面积广,减产幅度大。为了摸清低温对延迟生育和产量构成诸因素的影响,我们于1978—80年利用天佛指山的自然垂直温度差异对水稻抽穗以前的几个主要生育阶段进行了不同程度低温的处理,分析了低温对产量形成的影响规律。试验方法是:在试验基点温室培植长势均一的供试植株(供试品种为中晚熟京引127 Cold damage to the northern rice fields are extremely harmful, of which the majority of delayed cold damage, victims of a wide area, large-scale reduction. In order to find out the effects of hypothermia on delayed fertility and yield components, we used the natural vertical temperature differences of Tianfudidishan from 1978 to 1980 to analyze and analyze the low temperature at different degrees before rice heading stage. The impact of low temperature on the formation of the law. Test method is: in the test base greenhouse cultivating uniform growth of the test plants (test varieties for the late-late Jing cited 127