Abstract:

In order to found the large-yield and low-consumption fertilization program to Bupeurum chinense DC in semi-arid region of the Loess Plateau, the mathematical model of nitrogen, phosphorus and potassium application code on root yield a of Bupeurum chinense DC. was established based on field experiment using second universal rotary combination design, in semi-arid region of the Loess Plateau. The results showed that the order of the effect of nitrogen, phosphorus and potassium on yield improvement was phosphorus>potassium>nitrogen. Nitrogen and phosphorus had optimal fertilization amounts within the scope of experiment while potassium was not. And the fertilizer interaction effects were existed. There was great interaction between phosphoru and potassium, high root yield which up to 700 kg/hm2 occurred in high phosphorus and potassium conditions. Optimization results showed that under these conditions which economic outputs was above 600 kg/hm2, net income was above 22500 yuan/hm2 , and 95%confidence region, the optimal fertilization amounts was: N 150.90-209.14 kg/hm2; P 753.38-933.05 kg/hm2; K 190.96-255.62 kg/hm2. Application quality of nitrogenous, phosphorus and potassium fertilizer are closely related with yield of Bupeurum chinense DC. It should be used high potassium to reach high root yield.