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四川简阳地区以往种植棉花都是迟到谷雨播种,秋分左右就拔了稭,其整个生育期只有150天左右,开花结铃期约40多天。根据历年简阳气象资料(表一)历年日平均气温大于10℃以上的初终日期表明(表一):只要充分满足种子发芽所需水分及氧气,三月一日以后的温度就能基本满足棉花出苗的要求。但是出苗的快慢与大于10℃以上的气温的能量积累有密切的关系。播种后的温度高,积累越快,而发芽迅速,需时较少。若温度低于10℃以下,而长期不能在种子萌动开始温度(10℃)以上累积一定的能量,即不出苗。尤其是种子处于低温,
In the past, cotton fields planted in Jianyang, Sichuan Province, were lately sowed with Guyu and the stalk was pulled up around the autumnal equinox. Its entire growth period was only 150 days and its flowering period was about 40 days. According to calendar year Jianyang meteorological data (Table 1) calendar year average daily temperature is greater than 10 ℃ above the initial date shows (Table 1): as long as sufficient to meet the seed germination of water and oxygen, the temperature will be able to basically meet the cotton after March 1 The emergence of the request. However, the rate of emergence is more than 10 ℃ above the temperature of the energy accumulation is closely related. After sowing the temperature is high, the accumulation of faster, and germination quickly, take less time. If the temperature is below 10 ℃, and the long-term seed germination can not start the temperature (10 ℃) above a certain amount of energy accumulation, that is, no emergence. In particular, the seeds are at low temperature,