黑垆土供钾特性与烤烟对钾的吸收

The Characteristic of Potassium in Heilu Soil and the Absorbtion of Potassium for Tobacco Plant

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。

A dstermination on different states of potassium element and their main physicaland chemical characters of 100 soil saniples of Heilu soil of cure tobacco planting site in represe-tative regions of Shaanxi province, and a chemical analysis on the potassium content in tobacco leaves of 100 leave samples corresponding to the regions had been conducted. The result showed :(1) The potassium in subsiituiive state in soil was 12. 07% , 3.85% and 3. 65% of nonsustitutedstate , mineral state and total potassium content respectively, and the potassium content in mineralstate amounted to, 94. 85% of total potassium in soil; (2) potassium contents in various stateswere positive correlation to organic matter. content, Potassium contents in water soluble statewere significant negative correlation to clay particle in physical behavior in Hei-lu soil and thepotassium contents in substitative state were significant positive correlation to the clay particle,CEC and the potassium in water soluble state; (3) The releasing process of slow-release potassi-um was fitte'd to the y=ax-b and the organic matter content was a main influencing factor ofquickacting potassium in supply and supplement in soil ; (4) A regression analysis on potassiumcontents in various states with the potassium contents in tobacco leaves showed that quick-actingpotassium content in soil around tobacco planting was high significant positive correlation to thepotassium content in tobacco leaves.