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棉花原产于亚热带,属喜温、好光植物。棉花种子在水分、空气条件适宜时,10—12℃即可萌发。种子吸水后,酶的活动促使淀粉转化为醣,蛋白质转化为氨基酸。但在上述温度条件下,这些生物学过程很慢,它们随着温度的升高而加速。据试验,播种深处日平均土温在10—12℃时,播后一个月左右的时间才能出苗,且苗子瘦弱,参差不齐;播种深处日平均地温15℃左右,14—15天出苗;20℃时,8—9天出苗。据中央气象局等单位资料,
Cotton native to the subtropical, is a temperature, good plants. Cotton seeds in the water, air conditions suitable, 10-12 ℃ germination. After the seeds absorb water, the activity of the enzyme causes the starch to be converted into sugar and the protein into amino acids. However, at these temperatures, these biological processes are slow and they accelerate with increasing temperature. According to the test, the depth of planting depth of the average soil temperature at 10-12 ℃, after sowing a month or so time to emerge, and the thin and thin seedlings, uneven; sowing deep average daily temperature of about 15 ℃, 14-15 days of emergence ; 20 ℃, 8-9 days of emergence. According to the Central Meteorological Bureau and other units of information,