Study on Effect of Formula Fertilization by Soil Testing on Vegetable Virus-free Potato

[Objective] The aim was to explore the higher yield optimal fertilization ratio and establish fertilization guidance mathematical model in ecological environment like Bijie City of Guizhou Province.[Method] Through tests of vegetable potato Xuanshu3 by3414 formula fertilization,analyzed the optimum ratio of fertilization.[Result] The results showed that the medium fertility tests applied N fertilizer 210.3 kg/hm2,the P fertilizer 36.3 kg/hm2,K fertilizer 413.1 kg/hm2,available potato 18 146.1 kg/hm2.Low fertility tests applied N fertilizer 117.15 kg/hm2,P fertilizer 79.8 kg/hm2,K fertilizer 191.55 kg/hm2,could obtain potato 18 610.35 kg/hm2.High fertility tests plots due to higher basic soil N content could meet the demand for potato growth stage of N elements,so no application.The best fertilization was applied P fertilizer 242.7 kg/hm2,K fertilizer 522.3 kg/hm2,could obtain the production of potato 18 648.15 kg/hm2.[Result] The results provided guidance to field production.