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对土壤８个肥力指标进行主组元分析。结果表明，影响烟草生长的土壤因素主要有粘、酸，以及磷、钾养分不足。通过改善土壤结构，调节土壤反应，进行地膜覆盖与分层施肥，以及平衡施用肥料，可有效地改善不良的肥力因子，建立生产优质烟的土壤条件。根据主组元方程，大致可把福建省主要烟区土壤肥力分为较高、中等和较低３种等级，各自所产烟叶产量、产值、均价和上中等烟叶比例均有显著差异。
Eight principal components of soil fertility were analyzed. The results showed that the main soil factors that affect the growth of tobacco are sticky, acid, and phosphorus and potassium. By improving the soil structure, regulating the soil reaction, mulching and stratification fertilization, and balanced application of fertilizers, it can effectively improve the poor fertility factors and establish the soil conditions for producing good quality tobacco. According to the principal component equation, the soil fertility of main tobacco-growing areas in Fujian Province can be roughly divided into three levels: high, medium and low, yield, output value, average price and the proportion of middle-grade tobacco leaves are significantly different.