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适时播种,保证棉花全苗壮苗是夺取棉花高产的重要条件之一。棉花播种,何时最适宜,从有关报导来看,有的提日平均气温稳定通过12℃初日,有的提14℃初日,有的提五厘米深的土壤温度稳定通过12℃,14℃初日,究竟以何种温度为适宜,现分析讨论如下: 从以往使用的情况来看,用日平均气温和五厘米深的土壤温度稳定通过12℃或14℃初日,这两个指标都有不足之处。主要表现在: (一)各年日平均气温稳定通过12℃初日和五厘米深土壤温度稳定通过12℃有较大的差异。现以我区主要棉区新余县气象站的资料为例,日平均气温稳定通过12℃初日最早可在3月19日出现,最迟在4月10日,早、迟时间相差22天。五厘米深的土壤温度稳定通过12℃初日的时间,最早可在3月17日,最迟在4月10日,早、迟时间相差也较大(详见表1)。
Timely sowing, cotton seedlings to ensure strong seedlings is to win one of the important conditions for high-yield cotton. Cotton sowing, when the most appropriate, from the reports point of view, and some raised the average daily temperature stabilized by the first day at 12 ℃, some mention the first day of 14 ℃, and some soil temperature to mention five centimeters through 12 ℃, 14 ℃ first day , What kind of temperature is appropriate, the analysis is as follows: From the past use of the situation, with the average daily temperature and soil temperature of five centimeters deep through the first 12 ℃ or 14 ℃, both indicators have inadequate Department. Mainly in: (a) the average daily temperature in each year by 12 ℃ early and five centimeters deep soil temperature through 12 ℃ have a greater difference. Take the data of Xinyu County meteorological station, the main cotton area in our district as an example. The average daily temperature is stable as early as March 19 when the average daily temperature is 12 ℃, and 22 days in the morning and late at April 10 at the latest. Soil temperature of five centimeters deep through the first day of 12 ℃, the earliest in March 17, the latest in April 10, early, late time difference is also larger (see Table 1).