In the present study,with the conventional fertilization method using urea as CK,a field experiment was conducted to study the influence of controlled release nitrogen fertilizer on chlorophyll content in the main stem leaf of cotton,cotton yield and its component factors,cotton fiber quality and nitrogen use efficiency. It was shown that,with the same application amount of nitrogen,the yield of seed cotton and lint cotton was significantly( P < 0. 05) increased under the controlled release nitrogen fertili...