| According to the meteorological data(19612003) from Alar Meteorological Bureau(former Alar Meteorological Station), the initial and final date and the accumulated temperature of certain boundary temperature have been counted by the methods of average value and 5-days gliding average value.The results show: In Tarim irrigated area,the annual average total sunshine time is 2 873.3 h,the sunshine percentage is 65% the daily average sunshine time in the key development period of cottons is above 9 h,and the period during which the daily average temperature is kept at 2530℃ is 52 days;The initial and final date with ≥10℃daily average temperature is April 1 and October 18 respectively,the duration period is 201 days,and the average value of ≥10℃ accumulated temperature is 4 112.3℃;The initial and final date with ≥15℃daily average temperature is April 24 and September 30 respectively,the duration period is 160 days,and the average value of ≥15℃ accumulated temperature is 3 566.5℃.It is concluded that: In Tarim irrigated area,the length and amount of sunshine is very superior,and the weather in the late growth period of cotton is clear,being beneficial to the cracking of cotton bolls and the production of high quality cotton fiber;The safe growth period of cotton is relatively long and the heat condition is good,but the temperature in autumn is lowered quickly and the quantity of heat during vomiting period is slightly insufficient,so it is necessary to plant early-ripening cultivars in this area. |