湖南洞庭湖区杂交晚稻生育后期常常遇到9月中、下旬的规律性低温危害,结实率不高,产量不够理想。本试验着重研究低温导致湖区杂交稻结实率低的原因及其花期低温的临界指标,试图为杂交稻耐冷性育种,生产上鉴定、筛选抗寒性较高的组合或品种,以及寻求湖区杂交稻合理的品种搭配、? Late Maturity Hybrid Late Rice in Dongting Lake of Hunan Province often encounters regular cold damage in late September and late September with low seed setting rate and unsatisfactory yield. This experiment focused on the low temperature leading to the low rate of seed setting rate of the hybrid rice in the lake and the critical index of low temperature in flowering stage, attempting to identify the cold tolerance of hybrid rice, identifying the higher cold tolerance combinations or varieties, and seeking hybrid rice With a reasonable variety,?