高纬寒地是指我省纬度高,北纬50°15′前后。气温冷凉.生育期有效积温1900℃～2100℃,处于黑龙江省农业区划的第四、五积温带之间。这里的水稻生产常由于寒流过境,夏季出现短时期低温,影响水稻的正常生育,遭受障碍型冷害,发生不同程度的空壳现象,降低水稻的产量。根据调查和试验材料,看出在水稻生产的不同年份里,因种植的品种、栽培技术、土地营养状况、灌溉水 High latitude refers to the high latitude and longitude latitude, latitude 50 ° 15 ’before and after. The temperature is cold and cool, and the effective accumulative temperature of 1900 ~ 2100 ℃ during the growth period is between the fourth and fifth accumulated temperate zone of the agriculture division of Heilongjiang Province. The rice production here often passes through the cold current and the short-term low temperature in summer affects the normal growth of rice and suffers from the obstruction-type chilling injury, resulting in different degrees of empty shell phenomenon and reducing the yield of rice. According to the survey and test materials, we can see that in different years of rice production, due to cultivated varieties, cultivation techniques, land nutritional status, irrigation water