前言杂交稻汕优6号,在本省引种、推广以来,增产效果明显。目前,浙南已成为连作晚稻的当家品种,浙北也有不同比例的推广。汕优6号是感温性较强的组合,在本省连晚栽培中,低温冷害仍然是影响增产的重要限制因子。低温对晚稻的危害,有关的研究认为有以下几个阶段,即幼穗分化期(抽穗前23—30天);花粉母细胞减数分裂期(抽 Introduction hybrid rice Shanyou 6, introduction in the province, since the promotion, increase production is obvious. At present, southern Zhejiang has become even the late-heading varieties, northern Zhejiang also have different proportions of promotion. Shanyou 6 is a combination of strong sense of temperature in the province even late cultivation, chilling injury is still an important limiting factor affecting the yield. Low temperature on late rice damage, the relevant research that there are the following stages, namely panicle differentiation period (23-30 days before heading); pollen mother cell meiosis (pumping