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为分析曲靖市烟田土壤与烟叶钾含量的关系,调查了在垂直生态条件差异较大时,烤烟中部叶钾含量与土壤化学性状、海拔之间的关系。结果显示,曲靖市烟叶钾含量平均为1.51%,含量范围0.29%~3.01%,土壤有机质、碱解氮、速效钾、有效镁以及取样点海拔影响烟叶钾含量。土壤速效钾含量是影响曲靖市烟叶钾含量的最主要的因素,烟叶钾含量随土壤速效钾含量的增加而上升。土壤速效钾含量≤175.22 mg/kg或>276.010 mg/kg时,烟叶钾受土壤有效镁影响较大;速效钾含量在175.220~276.010 mg/kg时,土壤水溶性氯则成为烟叶钾的主要影响因素。海拔对烟叶钾含量影响分割点分别是1700、1822和2023 m,随高度增加,烟叶钾含量呈现逐步下降的趋势。
In order to analyze the relationship between tobacco soil potassium content and leaf potassium content in Qujing City, the relationship between potassium content in middle leaves of tobacco leaves and soil chemical properties and altitude under different vertical ecological conditions was investigated. The results showed that the average potassium content in tobacco leaf was 1.51% and the content range was 0.29% ~ 3.01%. The contents of soil organic matter, available nitrogen, available potassium and available magnesium and the elevation of sampling sites affected the content of potassium in tobacco leaves. The content of available potassium in soil was the most important factor affecting the content of potassium in tobacco in Qujing City. The content of potassium in leaf increased with the increase of content of available potassium in soil. When available potassium was less than 175.22 mg / kg or> 276.010 mg / kg, soil potassium was more affected by soil available magnesium. When soil available potassium was 175.220-276.010 mg / kg, soil soluble chlorine was the main effect of potassium factor. The effect of elevation on leaf potassium content was 1700, 1822 and 2023 m, respectively. With the increase of altitude, the content of potassium decreased gradually.