“白露早,寒露迟,秋分种麦最当时”的农谚,在北京及其附近省区广泛流行。虽然还有“白露高山,寒露平川”之说,但在冬小麦生产中还是争种秋分麦,并形成传统。关于播期对冬小麦籽粒产量影响的报道是经常可见的。如苏联西北部平原地区曾用15个品种于10～12月份做分期播种,平均籽粒产量分别是48.9、49.1和38.5公担/公顷,平均产量最高的播期在11月10～18日,平均产量最低的播期是12月10～15日,相差10.6公担/公顷。在新西兰的Manuwatu,传统的小麦播种时间在9月中旬到10月初。但试验结果表明,迟播 “Lunar morning of white dew, late cold dew, seasonal autumn wheat” at the time of the proverbs, in Beijing and its neighboring provinces widely popular. Although there are “white dew mountains, cold Lu Ping Chuan,” said, but in the winter wheat production or fight autumn wheat points, and the formation of the traditional. Reports on the effect of sowing date on grain yield in winter wheat are often visible. For example, in the northwestern plain of the Soviet Union, 15 varieties were sown in stages from October to December with an average grain yield of 48.9, 49.1 and 38.5 mm3 / ha, respectively. The highest average yield of sowing dates was from November 10 to 18, with an average of The lowest yield sowing date is December 10-15, a difference of 10.6 millibars per hectare. In Manuwatu, New Zealand, traditional wheat planting dates from mid-September to early October. However, the test results show that late broadcast