土壤供钾水平对烤烟生长及钾素营养的影响

Effects of Soil Potassium Supply Level on Development and Potassium Nutrition of Flue-cured Tobacco

通过盆栽试验,研究了不同土壤供钾水平对烟株长势、生理生化指标和下部烟叶含钾量的影响,并以此制定钾素丰缺指标。试验结果初步得出,烤烟现蕾初期下部烟叶钾含量小于0.9%为缺钾,0.9%～1.25%为轻度缺钾,1.26%～1.60%为潜在缺钾,大于1.60%为钾素充足;土壤速效钾含量小于55 mg/kg为低,55～110 mg/kg为较低,110～160 mg/kg为中等,160～230 mg/kg为较丰富,>230 mg/kg为丰富。

A pot experiment was conducted to study the effects of soil potassium supply level on the growth, indices of physiology and biochemistry, and the potassium content in lower leaves of tobacco plant. The results showed that in early budding stage, when the potassium content of lower leaves was below 0.9%, the tobacco plant was deficient in potassium, when the content ranged 0.9%-1.25%, the tobacco plant was less deficient in potassium, and 1.26%-1.6% was potencially deficient, over 1.60% was sufficient. The content of soil available potassium was lower when below 55 mg/kg, deficient when 55-110 mg/kg, moderate when 110-160 mg/kg, relatively rich when 160-230 mg/kg, and rich when over 230 mg/kg.