新沂市地处黄淮平原,东近黄海,属暖温带季风性气候,处于我国南北气候交叉带,34°N线穿过境内,全年无霜期210d左右。在杂交籼稻制种地区中位置偏北。相比南方制种区,春季籼稻早播界限期来得晚,秋季安全齐穗期结束得早,播种期弹性小,且生育期内更易受低温天气影响。制种生产上通过保温育 Xinyi City is located in the Huanghuai Plain, east of the Yellow Sea, is a warm temperate monsoon climate, in China’s northern and southern climate cross belt, 34 ° N line through the territory of the annual frost-free period 210d or so. In hybrid indica rice seed production area northward. Compared to the southern seed production area, the early sowing date of spring indica rice came later in autumn, and the safety of autumn heading stage ended earlier and the sowing period was less elastic and more vulnerable to the cold weather during the growing season. Seed production through incubation insulation