[Objective] The study aimed to make clear the status of soil fertility in Qujing tobacco-growing area and provided the theoretical basis for the production of tobacco with good quality.[Method] 340 soil samples were selected from the tobacco-growing areas in 9 counties or cities of Qujing City in Yunnan Province and the methods of factor analysis and membership function of fuzzy mathematics were used to estimate the status of soil fertility in Qujing tobacco-growing areas. [Result] There was significant variation on the soil fertility in Qujing tobacco-growing areas. The soil fertility index (SFI) values of all soil samples ranged from 0.311 to 0.900, with an average of 0.671 and the variation coefficient of 14.57%. According to the size of SFI values, the soil fertility could be divided into 5 grades of high, higher, medium, lower and low. The soil with fertility at more than medium grade accounted for 99.12%, in which, the soil with fertility at high and higher grade accounted for 10% and 67.94%, resp. [Conclusion] The comprehensive fertility index in tobacco-growing areas of Qujing City was higher and the soil samples with high and higher comprehensive fertility index accounted for 77.94% of total soil samples. But the contents of organic matter and available N were higher in general, the contents of total P, total K and available Mg were lower and the B content was seriously deficient. It was suggested that controlling N fertilizer, supplying Mg fertilizer and increasing B fertilizer should be paid more attention in balanced fertilization in Qujing tobacco-growing areas.%[目的] 明确曲靖烟区土壤养分状况,为优质烟叶的生产提供理论依据.[方法] 从云南省曲靖市9个县(市)的植烟区采集340个土壤样品,采用因子分析法和模糊数学隶属度函数模型对曲靖市植烟土壤状况进行综合评价.[结果] 曲靖烟区土壤肥力存在广泛变异,其土壤肥力指标(SFI)值平均为0.671,变幅为0.311～0.900,变异系数为14.57%.根据SFI值的大小将全市土壤肥力分为高、较高、中等、较低和低 5个等级,中等肥力以上占99.12%,其中高和较高等级肥力的土壤分别占10%和67.94%.[结论] 曲靖市烟区的综合肥力指标较高,高和较高综合肥力指标的土样占总土样的77.94%,但土壤有机质、碱解氮含量偏高,全磷、全钾和有效镁含量偏低,严重缺硼,建议曲靖烟区在平衡施肥时要注意控制氮肥,补充镁肥,增施硼肥.
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