土壤供钾状况及土壤湿度对我国北方烤烟烟叶含钾量的影响研究

Potassium content in tobacco leaves related to soil potassium supply and soil moisture regimes

田间采样统计分析和框栽试验结果表明 ,土壤钾素状况及土壤的供钾能力是影响我国北方烟区烤烟烟叶含钾量的主要因子之一 ,合理施用钾肥和改善土壤的钾素状况是提高烟叶含钾量的有效措施 ;土壤湿度是保证土壤钾素向烟株根系运动的必要条件 ,在烟株生长期间 ,特别是在烟株移栽 4 0— 50天期间 ,保持土壤的相对含水量 6 0— 70 % ,是促进烟叶吸钾 。

The main factors, which affect the potassium content in tobacco leaves in the North of China, were the status of soil potassium and soil potassium supply, revealed by field and cultural experiments. Adequate application of potassium fertilizer and the capacity of soil K supply were important factors for increasing tobacco yields. Soil moisture was a prerequisite for the transport of K from soil to tobacco roots, thus keeping the soil moisture at 60% to 70% (field capacity) 40 to 50 days after transplanting was a necessary measure for K uptake by the plant.