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为研究云南曲靖中海拔红壤烟区烤烟镁含量状况及影响因素,连续两年采用田间实地调查及室内化验分析的方法,明确了区域内不同县(市)烟区和主栽品种烤烟镁含量状况及土壤p H值、有机质含量、速效钾含量、交换性镁含量等对烤烟镁含量的影响趋势,结果表明:曲靖中海拔红壤烟区烟叶镁含量范围为0.07~1.15%,平均含量0.42%±0.18,变异系数42.86%。烤烟镁含量处于我国适宜镁含量范围的样品占46.78%。除师宗县外,其他各县(市)烟区有一半以上烤烟样品镁含量缺乏;主栽的9个品种中,中烟100、K326、云烟85和云烟97镁含量分别为0.70%、0.53%、0.43%和0.41%,处于适宜水平,适合在该区域大面积推广。根据土壤肥力标准分组后,烤烟镁含量随有机质和有效镁含量的增加而增加,烤烟镁含量与土壤p H值和速效钾含量呈抛物线关系,总体表现为随土壤p H值和速效钾含量的增加呈现先增加后降低的趋势。
In order to study the status and influencing factors of magnesium content in flue-cured tobacco in red soil area of middle-altitude in Qujing, Yunnan Province, using field survey and laboratory analysis for two consecutive years, the status of magnesium in flue- cured tobacco in different counties (cities) And soil p H value, organic matter content, available potassium content and exchangeable magnesium content on the magnesium content in flue-cured tobacco were investigated. The results showed that the magnesium content of tobacco in the red soil of Qujing ranged from 0.07 to 1.15% with an average content of 0.42% ± 0.18, coefficient of variation 42.86%. Flue-cured tobacco magnesium content in our country suitable for the range of magnesium samples accounted for 46.78%. In addition to Shizong County, more than half of the flue-cured tobacco samples in other counties (cities) lacked magnesium content. Among the nine cultivars, the contents of 100, K326, Yunyan85 and Yunyan97 were 0.70%, 0.53 %, 0.43% and 0.41%, at the appropriate level, suitable for large-scale promotion in the region. When grouped according to soil fertility standard, the content of magnesium in flue-cured tobacco increased with the increase of organic matter and available magnesium. The content of magnesium in flue-cured tobacco showed a parabolic relationship with soil p H value and available potassium content. The overall performance was as a function of soil p H and available potassium content Increase the trend of the first increase and then decrease.