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早播是棉花增产的主要措施之一,近年来各地棉花的增产具体事实也有力地证明了这一点。但棉花早播后常易受霜冻。由于各个地区的自然因子不同,因之播种期也有差异,就形成因霜冻之迟早而影响与限制了提早播种期。有些地区因为晚霜迟,播种期也随之推延,有时因气候的变化大,往往使棉花的生长发育得不到理想的生活条件,因而降低了产量。陕北绥德地区自然气候变化急骤,日较差很大,年季气候相差也非常悬殊,尤其春季在亢旱多风的情况下变化更难掌握,根据绥德三
Early sowing is one of the major measures to increase cotton production. In recent years, the specific facts concerning the increase in cotton production have also proved this forcefully. But cotton is often susceptible to frost after it is sown early. Due to the different natural factors in various regions and the differences in sowing dates, the early sowing period due to the frost may be affected and restricted. In some areas, because of the late late frost, the sowing period will also be delayed. Sometimes due to the large changes in the climate, the growth and development of cotton will often fail to obtain ideal living conditions, thus reducing the yield. In Suining, northern Shaanxi, the natural climate change is steep, the daily difference is very big, and the annual climate difference is very different. Especially in the spring, the change is more difficult to be grasped under the condition of drought and windy wind. According to Suide 3