摘要
在石灰性黄褐土上通过施用不同量的钾肥 ,研究了烟草体内及土壤中钾素与钙、镁的关系。结果表明 ,在石灰性土壤中 ,受钙、镁离子的影响 ,烟叶含钾量整体较低 ,施钾可以提高钾素吸收 ,相对减少对钙、镁的吸收 ,从而提高烟草产、质量。土壤及烟草体内含钾量与烟叶产量分别呈指数关系 ;随施钾量的增加 ,烟叶产量及中上等烟叶的比例相对提高。利用植株或土壤中钾与钙镁的比值 (A)作为反映土壤或烟草体内钾素与钙镁之间平衡关系的一种指标 ,对指导施钾有一定意义。烟草移栽后 5 5d土壤中A值为 19.5 ,或移栽后 70d烟草叶片中A值为 0 .72时 ,烟草吸钾最多 ,产质量最高 。
The relationship between K and Ca/?Mg in tobacco and soil and their relations to yield and qualities of tobacco were investigated in Yellow cinnamon soil with application of different potash rates. The results showed that in calcareous soil, the K contents in tobacco leaves were lower due to rich Ca and Mg ions. Applying K could increase the K contents and reduce the absorption of Ca and Mg, and therefore increase the yield and qualities of tobacco. The relation of K contents in plant and soil to the yield follows exponential type. Tobacco yield and the proportion of mid high grade leaves were increased with the K applied. The A value, i.e. the concentration ratio of K to Ca+Mg in plant or soil could be used as an index of balance among K to Ca+Mg in plant or soil. The A values being 19.5 in soil at 55 days after transplanting, or being 0.72 in tobacco leaves at 70 days after transplanting could be used as the reference index for more K absorption to grow better tobacco in Yellow cinnamon soil.
出处
《中国烟草学报》
EI
CAS
CSCD
2000年第1期23-26,共4页
Acta Tabacaria Sinica
关键词
烟草
烟叶质量
钾与钙镁相互关系
Tobacco leaf quality
Potassium and Calcium/Magnesium relationship
