1998年低温冷害对水稻生育的影响

１９９８ 年分蘖前期低温，使水稻出叶及出分蘖速度减慢，叶色浅，营养生长延迟，后期升温，出叶速度和出分蘖速度以及叶色级数迅速增加，营养生长得到恢复，有效分蘖终止期和最高分蘖期的叶龄指数分别降低２ ％ 和４ ％ ，有效分蘖率降低３ ％ ．

Effect of low temperature and cold injury in growth of rice

The speeds of outgrowing leaves and tillering were retarded by low temperature at the prophase of tillering in 1998, and leaf color of rice was light, and its vegetative growth was delayed. Because air temperature raised at the anaphase of tillering, the speeds of outgrowing leaves and tillering and the grade of leaf color increased rapidly, vegetative growth was resumed, the leaf age index in time of the last bearing tiller emergence reduced 2%, and that in peak tillering stage reduced 4%, valid tiller ratio reduced 3%.