The optimum design of N, P with 5 levels and N, P, K with 5 levels was adopted in the experiment. The field experiment was conducted in the Danshen base of Shaanxi Tasly medicine Plant limited Company in Shangzhou city Shaanxi province. The response N, P and N, P, K of different soil condition and different fertilizer rate were obtained. According to the response equations the optimum amount of N, P, K fertilizers were obtained. Fertilizer amount of N, P was N 115. 5-214. 3 kg/hm2 and P2O5 153. 4-243. 4 kg/...
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