嫩江地区位于北纬47—48度,无霜期120天,年平均气温2.2℃,全年有效积温为2,565℃,且变化大,雨量集中,西部风砂干旱,农业生产中自然灾害比较多。玉米是我区的重要粮食作物之一,但长期以来,玉米产量不高不稳,对全区粮食产量的增长影响很大。针对这一问题,几年来,我们从玉米的冷害问题入手,作了一些研究和调查,现谈谈初浅的认识。 Nenjiang is located at 47-48 degrees north latitude, frost-free period is 120 days, annual average temperature is 2.2 degrees centigrade, annual effective accumulated temperature is 2,565 degrees centigrade, and the change is big, the rainfall is concentrated, the western wind sand is droughty and there are many natural disasters in agricultural production. Corn is one of the important grain crops in our district. However, the output of maize has not been high and unstable for a long time, which has a great impact on the growth of grain output in the whole region. In response to this problem, in the past few years, we started with the issue of chilling injury in maize and made some research and surveys.