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运用均生函数逐步回归方法制作吉林省玉米春季始播期（≥７℃初日）预测，结果表明以序列长度为３６年的试验效果最好。用长春１９６１～１９９７年的资料计算了全省１９９８、１９９９、２０００年的≥７℃初日分别是４月中旬、４月中旬末至４月下旬初、４月下旬。
The prediction of spring seeding period (≥7 ℃ first day) of maize in Jilin Province was made by means of stepwise regression with a mean of birth function. The results showed that the test with the best length of 36 years was the best. The data of Changchun from 1961 to 1997 were used to calculate the first day of ≥7 ℃ in 1998, 1999 and 2000 of the whole province from mid April, from the middle of April to early April and late April respectively.