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以黑龙江省第二积温带的巴彦、佳木斯、林甸和宁安4个代表市县2004年至2013年间4~5月份日平均地温为基础数据,结合地温的变化规律和玉米种子适宜萌发温度,确定该积温带的玉米播种日期。结果表明,日平均地温均随着日期增加在波动中增长,4月1~9日,地温增长比较稳定,曲线波动幅度相对较小;4月10~23日,曲线波动幅度最大。10年间地温稳定通过6℃、7℃、8℃、9℃和10℃的平均日期分别为4月6日、4月13日、4月18日、4月19~27日,年际间差异明显。此积温带的玉米最早播种期为4月18日,适宜播期为4月23日至5月5日。
Based on the daily average ground temperature from April to May in four representative cities and counties of Bayan, Jiamusi, Lindian and Ning’an in the second accumulated temperate zone of Heilongjiang Province, in combination with the variation law of ground temperature and the suitable germination temperature , To determine the temperature of corn seeding date. The results showed that the daily average ground temperature increased with the increase of the date, and the increase of the ground temperature was relatively stable from April to September. The fluctuation of the curve was relatively small. From April 10 to April 23, the curve fluctuated the most. The average temperature of 6 ° C, 7 ° C, 8 ° C, 9 ° C and 10 ° C in the 10 years was respectively April 6, April 13, April 18, April 19-27, obvious. This earliest plot of corn planting sowing on April 18, suitable for sowing April 23 to May 5.