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辽宁属特早熟棉区,无霜期一般只有一百四十五到一百六十五天。棉花生育的前期和后期,还经常有冷雨低温出现,一般在五月中、下旬还出现摄氏5度以下的低温,到九月中旬气温就下降到摄氏15度以下。棉花的有效生育期实际上只有一百三十天左右,单株生产力受到很大限制。针对这样的气候特点,为了夺取棉花高产,必须从有效利用生育期和充分发挥群体
Liaoning is a very early cotton area, frost-free period is generally only one hundred and forty-five to one hundred and sixty-five days. Early and late growth of cotton, but also often appear cold and rainy temperatures, usually in mid-May, late also appeared below 5 degrees Celsius temperature, by mid-September the temperature dropped to 15 degrees Celsius below. The effective growth period of cotton is only about one hundred and thirty days, and the productivity per plant is greatly restricted. In view of such climate characteristics, in order to seize the cotton yield, we must make effective use of the growth period and give full play to groups