本文在分析水稻分蘖期阴害指标的基础上,指出江苏淮南稻区阴害发生的气候规律。同时阐明水稻分蘖期阴害,使稻株体内糖氮比例严重失调,叶绿素a+b和a/b值发生显著的变化,光合作用受到阻碍。因而,导致分蘖数减少,干物重下降,株高增加,生育期延迟,且受害程度随不同阴害处理而异。 Based on the analysis of the index of the harmful elements in rice at tillering stage, this paper points out the climatic rule of the occurrence of the shade harm in the Huainan rice in Jiangsu Province. At the same time, it was clarified that the harmful effects of rice at tillering stage caused a serious imbalance of sugar and nitrogen in rice plants, significant changes in chlorophyll a + b and a / b values, and inhibition of photosynthesis. As a result, the number of tillers decreased, the dry matter weight decreased, the plant height increased, the growth period delayed, and the degree of victimization varied with different treatments.