Using the “3414” test design, the effects of N, P, K formula fertilization on the yield, sugar content and sugar yield of sugar beet were discussed, and the mixing ratio of NPK was optimized and analyzed by the fertilizer effect equation. The results showed that the yield, sugar content and sugar yield of sugar beet increased firstly and then decreased with the increase of NPK fertilizer, which was accorded with the law of diminishing returns for fertilizer. The effect of the different fertilizer on the yield and sugar yield of sugar beet was N>P2 O5 >K2 O, and the effect on sugar content was K2 O>P2 O5 >N. The fertilizer ratio of the treatment with all fertilizer ( N 260 kg/hm2 , P2 O5 130 kg/hm2 , K2 O 130 kg/hm2 ) was the best, and there were no significant differences with those in high N region, high P region and high K region. The ratio of output to input for all fertilizer area was relatively high, and got the highest yield of 47. 13 t/hm2 , the best planting benefit of 17 069. 34 yuan/hm2 , the highest sugar yield of 8. 108 8 t/hm2 and the best enterprises benefit of 33 217. 32 yuan/hm2 .%采用“3414”试验设计方案,探讨NPK配方施肥对糖用甜菜产量、含糖率和产糖量的影响,并通过肥料效应方程对NPK配合比率进行了优化与解析。结果表明,随着NPK肥施用量的增加,糖用甜菜产量、含糖率和产糖量均呈先升后降的趋势,符合肥料报酬递减律；甜菜产量和产糖量的效应为N>P2 O5>K2 O,含糖率的效应为K2 O>P2 O5>N；肥料配合比率以全肥区( N 260 kg/hm2、 P2 O5130 kg/hm2、 K2 O 130 kg/hm2)为最佳,与高N区、高P区和高K区无显著差异,且产投比相对较高,可获得最高产量47．13 t/hm2、最佳种植效益17069．34元/hm2、最高产糖量8．1088 t/hm2、最佳企业效益33217．32元/hm2。
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