为莲花白的科学合理施肥提供依据，采用“3414”肥效施肥试验设计，对其进行了肥料效应田间试验。结果表明：从肥料成本投入所能获得的最大效益考虑，各试验最佳施肥量：高肥力试验施纯N259．5kg/hm^2,B0，135kg/hm^2和K20308．7kg/hm^2，可获莲花白产量73556．85kg/hm^2；中肥力试验施纯N193．2kg/hm^2-P2O583．55kg/hm^2和K20192．15kg/hm^2，可获莲花白产量61167．3kg/hm^2。

[Objective] The aim was to explore the higher yield optimal fertilization ratio and establish ferilization guidance mathematical model in ecological environment like Bijie City of Guizhou Province.[Method]Through tests of vegetable potato Xuanshu3 by "3414"formula fertilization,analyzed the optimum ratio of fertilization.[Result]The results showed that the medium fertility tests applied. N fertilizer 210.3 kg/hm^2,the P fertilizer 36.3kg/hm^2,K fertilizer 413.1kg/hm^2,available potato 18 146.1kg/hm^2.Low fertility tests applied N fertilizer 117.15 kg/hm^2,P fertilizer 79.8kg/hm^2,K fertilizer 191.55kg/hm^2,could obtain potato 18 610.35kg/hm^2.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 242.7kg/hm^2.K fertilizer 522.3kg/hm^2,could obtain the production of potato 18 648.15kg/hm^2.[Result]The results provided guidance to field production.

The fertilizer effect on a virus-free vegetable potato cultivar,Xuanshu No.3,was studied through 3414 experiment.The results showed that the optimum N,P2O5,and K2O application dose were 200.6,129.3,and 215.3 kg/hm2 respectively in high fertility soils,under this condition,the yield of the potato cultivar could reach 10 777.1 kg/hm2 The optimum application dose of N,P2O5,and K2O in meddle fertility soils were 192.9,183.8,and 83.6 kg/hm2 respectively;and in low fertility soil were 74.1,87.0,and 29.1 kg/hm2 respectively;and the corresponding yields were 13 713.0 kg/hm2 and 9 070.8 kg/hm2 respectively.