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对分布子陕西省具有代表性的烟区土壤（黑垆土）１００个土样不同形态钾的测定以及１００个烟样烟叶含钾量分析结果表明：①土壤中代换态钾分别为非代换态钾、矿物态钾和全钾的１２．０７％、３．８５％和３．６５％。非代换态钾为矿物钾和全钾的３１．８８％和３０．２４％。矿物态钾占全钾的９４。８５％。②各种形态钾与有机质均呈正相关，水溶态钾与黑护土物理性粘粒呈显著负相关，代换态钾与黑垆土物理性粘粒、ＣＥＣ及水溶态钾呈显著正相关。③土壤缓效钾是钾素供应的潜在指标，其释放过程符合ｙ＝ａｘ－ｂ形式，而有机质是影响土壤速效钾供应和补给的重要因子。④不同形态土壤钾与烟叶含钾量回归分析表明，种烟前后土壤速效钾含量均与烟叶含钾量极显著正相关。
The results showed that: (1) The determination of different forms of potassium in 100 soil samples and the analysis of potassium content in 100 tobacco samples from the tobacco distribution area in Shaanxi Province showed that: (1) Kinetic potassium, mineral potassium and total potassium 12.07%, 3.85% and 3.65%. Non-substituted potassium is 31.88% and 30.24% of mineral potassium and total potassium. Mineral potassium accounts for 94.85% of total potassium. (2) There was a positive correlation between various forms of potassium and organic matter. There was a significant negative correlation between water-soluble potassium and physical clay of black soil. There was a significant positive correlation between substitution potassium and physical clay, CEC and water-soluble potassium. Soil slow-acting potassium is a potential indicator for the supply of potassium, and the release process is in the form of y = ax-b. Organic matter is an important factor affecting soil available potassium supply and recharge. ④ Regression analysis of potassium content in different forms of soil and leaf showed that there was a significant positive correlation between soil available potassium content and potassium content before and after tobacco cultivation.