Abstract: In order to improve the potassium content and quality of tobacco plants, this paper applied walic acid and citric acid on pot cultured tobacco varieties to analyze their effects on leaves potassium content, soil available potassium content, and flue-tobacco physiological characters. The results showed that the leaves potassium content, chlorophyll content, root system activity and soil available potassium content treated with organic acids were all higher than contrast, but the catalase activity of tobacco plant was lower than that of the contrast. Malic acid could increase the soil available potassium content, leave potassium content, chlorophyll content, leave catalase activity, leave peroxidase activity, MDA content, root system catalase activity, and root peroxidase activity; while the root system activity, leave and root superoxide dismutase activity, and root MDA content treated with citric acid were higher than those treated with malic acid. These results provided reference for field tobacco leaf production.

Key words: exogenous organic acids, physiology, available potassium, tobacco

摘要： 为了提高烟株的钾含量和品质，通过对盆栽烟草品种施用苹果酸和柠檬酸，分析其对烟叶钾含量、土壤速效钾含量和烟草生理特性的影响。结果表明：经过有机酸处理的烟草叶片钾含量、叶绿素含量、根系活力和土壤速效钾含量都高于对照，烟株抗逆酶活性低于对照。其中苹果酸处理的根际土壤速效钾含量、烟叶钾含量、叶绿素含量、烟叶过氧化氢酶活性、烟叶过氧化物酶活性、烟叶丙二醛含量、根系过氧化氢酶活性和根系过氧化物酶活性高于柠檬酸处理，而根系活力、烟叶超氧化物歧化酶活性、根系超氧化物歧化酶活性和根系丙二醛含量低于柠檬酸处理。该结果可为大田烟叶生产提供一定的参考。

关键词: 外源有机酸, 生理, 速效钾, 烟草