With Huangguogan as materials and conventional fertilization as control, the effects of N, P, K and mixed NPK fertilizer on the sugar content were studied. The accumulation and change of sucrose, fructose and glucose during fruit growth and maturation were determined by high performance liquid chromatography (HPLC). The results show that the HPLC method used in this paper has good precision, repeatability, stability and recovery of the sample, and the sample is stable within 72 h, indicating that the method is of high accuracy. During the fruit growth and maturation of Huangguogan, the proportion of sucrose in total sugar first decreased, then rose, and finally remained stable. The lowest proportion was 60 -90 days after flowering, while fructose and glucose were the opposite. Compared with conventional fertilization, nitrogen, phosphorus and potassium fertilizer all reduced the content of sugar in the fruit, and nitrogen fertilizer was the most obvious, and it mainly acted on sucrose. There was no significant difference between mixed NPK and conventional fertilization. To sum up, single application of nitrogenous, phosphorous and potassium fertilizer can reduce the sugar content of fruits, and the application of potassium fertilizer in the period of fruit expansion and maturity can increase the sugar content of fruits.
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