在播种—出苗期间,5公分地温有地膜比无地膜棉田要高出4度左右。就播种地温而言,有膜比无膜可早近20天出现。但早播棉花在出苗后常会遇到终霜冻害。因此,不能按地温情况而早播。作者研究石河子地区地膜棉花多年适宜播种日期为15—24/4。按此时期播种,5月1日前一般均可出苗,可 During the sowing - emergence period, the 5 cm soil temperature is about 4 degrees higher than the non-mulching cotton field. In terms of sowing geotextile, there is no film than the film can be seen nearly 20 days. However, the early spring cotton often encounter frost damage after emergence. Therefore, we can not broadcast as early as the ground temperature. The study of Shihezi cotton mulching suitable for many years for many years sowing date is 15-24 / 4. According to this period of sowing, before May 1 can generally emerge, may