Fertilization Effect and Optimum Fertilizer Rate of Xiangzamian No.7

In order to study the influences of different fertilizer rates on Xiangzamian No.7,to increase the unit yield of cotton and to save fertilizer cost,a 3415 manure trial was conducted in Leiyang of Hunan Province in 2010.The results showed that through analyzed data by quadratic regression matrix combing with three factors,the optimum economic yield,fertilizer rate of N,fertilizer rate of P2O5 and f…