黑垆土供钾特性与烤烟对钾的吸收

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着负相关,代换态钾与黑垆土物理性粘粒、CEC及水溶态钾呈显着正相关.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着正相关.

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

A determination on ditterent states of potassium element and their main physical and chemical characters of 100 soil samples of Hei-lu soil of cure tobacco planting site in represetative 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 substitutive state in soil was 12.07%.3.85% and 3.65% of nonsustituted state,mineral state and total potassium content respectively.and the potassium content in mineral state amounted to.94.85% of total potassium in soil;(2)potassium contents in various states were positive correlation to organic matter.content,Potassium contents in water soluble state were significant negative correlation to clay particle in physical behavior in Hei-lu soil and the potassium contents in substitutive state were significant positive correlation to the clay particle.CEC and the potassium in water soluble state;(3) The releasing process of slow-release potassium was fitted to the y=ax^-b and the organic matter content was a main influencing factor of quick-acting potassium in supply and supplement in soil;(4)A regression analysis on potassium contents in various states with the potassium contents in tobacco leaves showed that quick-acting potassium content in soil around tobacco planting was high significant positive correlation to the potassium content in tobacco leaves.