(1) According to the characteristics of the variety. Under the same production conditions, spring varieties should be properly broadcasted in the evening, and winter varieties should be broadcast early. (2) According to geographical location and topography. About 100 meters above sea level, the sowing date is about 4 days earlier, the same altitude is different latitude, the general latitude is reduced by 1 degree, and the sowing date is delayed by about 4 days. (3) Accumulated temperature before winter. Spring varieties require 625 degrees Celsius before winter, weak winter varieties require 700 degrees Celsius before winter, and pre-winter varieties require 775 degrees Celsius before winter.
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