吉林农大农场位于长春市郊,无霜期较短,9月末可见初霜,10月末可见霜冻。生育期较长的高产玉米品种,种子只靠自然干燥常常不能达到安全水分越冬,使发芽率大大降低,不少良种丧失了重用价值,造成很大损失,甚至给次年生产带来困难。我们于1981和1982连续两年在该农场 Jilin Agricultural Land is located in the outskirts of Changchun City, frost-free period is short, the first frost seen at the end of September, the end of October visible frost. Long-term high-yielding varieties of maize, the seeds can not always achieve safe water overwinter due to natural dryness, greatly reduce the germination rate, many of the elite lose their reuse value, cause great losses and even cause difficulties in the following year’s production. We were on the farm for two consecutive years in 1981 and 1982