The situation of soil fertility in Shidian flue - cured tobacco growing areas was comprehensively analyzed and evaluated by the principle of fuzzy mathematics and the method of multivariate statistical analysis. The results indicated that the average pH -value of soil was high (7. 13) , and the soil whose pH - value was suitable for the growth of flue - cured tobacco occupied 56. 86% of the total tobacco growing soil. The average content of organic matter was 31.08 g/kg, and the soil with appropriate organic matter content occupied 71. 57% of the total. The average contents of alkaline nitrogen, available phosphorus, available potassium, available boron, available zinc, water-soluble chlorine and exchangeable magnesium were 107.23, 21.56, 251.81, 0.46, 1.79, 16.65 mg/kg and 1.04 cmol/ kg respectively. The integrated index values of soil fertility in the different regions of Shidian county had significant difference, and they varied from 0. 302 to 0. 831, with the mean of 0.600 and the coefficient of variation of 19.00% . The proportion of grade I, H, 1 and IV soil was 22. 55% , 40. 20% , 28. 43% and 8. 82% respectively. The ratio of the soil at grade I ~ Ⅲ in Shuichang, Youwang and Wanxing tobacco areas all reached 100% , and that in Dianyang tobacco area was at the lowest level ( 80% ). The integrated index values of soil fertility in Shidian tobacco growing areas were high, but there were great differences in nutrient content among different fields, so it was suitable to apply appropriate amount of organic fertilizer, humic acid fertilizer and trace element fertilizer.%利用模糊数学原理和多元统计方法对云南施甸县烤烟种植区的肥力状况进行了分析与综合评价,结果表明:土壤平均pH值较高,为7.13,宜植烟土壤占总数的56.86％；有机质平均含量为31.08 g/kg,宜植烟土壤占总数的71.57％；碱解氮、速效磷、速效钾、有效硼、有效锌、水溶性氯平均含量分别为107.23、21.56、251.81、0.46、1.79、16.65 mg/kg,交换性镁的平均含量为1.04 cmol/kg.全县土壤肥力综合指标值存在较大差异,变幅为0.302～0.831,平均为0.600,变异系数为19.00％,其中Ⅰ、Ⅱ、Ⅲ、Ⅳ级土壤分别占总数的22.55％、40.20％、28.43％、8.82％,水长、由旺、万兴烟区的Ⅰ、Ⅱ、Ⅲ级土壤比例合计均达100％,甸阳的最低,为80％.施甸县烤烟种植区的土壤肥力综合指标值较高,但不同地块的养分含量差异较大,应适量施用有机肥、微量元素肥料.
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