朝阳位于辽宁省西南部 ,有 2 0 0多年植棉历史 ,80年代被国家定为长城外唯一的特早熟优质棉基地县。该县从 1 998年引进试种中棉所 2 7,当年多雨 ,生育期降雨 60 0 mm,1 999年干旱 ,生育期降雨只有 2 0 0 mm,两年试种 2 70公顷 ,各类土地条件均有种植 ,播期从 4月 1 5～ 5月 1 Chaoyang is located in the southwest of Liaoning Province, with more than 200 years of cotton-growing history. In the 1980s, the country was designated as the only special precocious cotton base county outside the Great Wall. In 1998, the county introduced a trial plant of cotton cultivation 27, when it was rainy with a rainfall of 60 0 mm in its growth period and a drought of 1,999 years. Its rainfall during its growth period was only 200 mm, that of 2 70 hectares was planted in two years, and all kinds of land Conditions are planted, sowing from April 1 May to May 1