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对陕西省烟区１００个黄绵土样的基本理化性状和不同形态钾含量进行了测定，并分析了相应的１００个烟样的烟叶含钾量，结果表明：①土壤中水溶态钾、代换态钾、非代换态钾、矿物态钾和全钾的平均含量分别为２１．１，１１５．２，７０１．２，１７２９５．１和１８２１６．０ｍｇ／ｋｇ．②各种形态钾与有机质均呈正相关，水溶态钾与黄绵土物理性粘粒呈显著负相关，代换态钾与黄绵土物理性粘粒、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模式。有机质是影响土壤速效钾的供应和补给的重要因子。④种烟前后土壤速效钾含量均与烟叶含钾量呈极显著的正相关
The basic physico-chemical properties and morphological K contents of 100 loessial soil samples were measured in the tobacco-growing areas of Shaanxi Province. The K content of 100 tobacco samples was analyzed. The results showed that: (1) The average contents of potassium, non-substituted potassium, mineral potassium and total potassium were 21.1, 115.2, 701.2, 17295.1 and 18216.0 mg / kg, respectively. 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 loessial soil. There was a significant positive correlation between substitutional potassium and physical clay, CEC and water-soluble potassium of loessial soil. Soil slow potassium is a potential indicator of the supply of potassium, the release process in line with Y = ax-b mode. Organic matter is an important factor affecting the supply and replenishment of available potassium in soil. ④ Before and after tobacco cultivation, the contents of available potassium in soil were positively correlated with the contents of potassium in tobacco leaf