Abstract
In order to investigate the characteristics of exchangeable calcium,exchangeable magnesium and Ca/ Mg ratio in flue-cured tobacco growing soils in Kunming,1000 representative samples were collected with GPS positioning and analyzed.The results showed that: 1) The contents of exchangeable calcium and magnesium were rich in the soil samples with the average value of 2728.36 and 294.71 mg/kg,respectively;and the samples with the Ca/Mg ratio higher than 10,which induced potential magnesium deficiency accounted for 37.50% of the total samples.2) The soil exchangeable calcium,exchangeable magnesium and Ca/Mg ratio were lower at the higher altitude areas than those at the lower altitude areas.3) Soil textures slightly affected the contents of exchangeable calcium and magnesium,however Ca/Mg ratio was relatively higher in soil with heavy texture in general.4) There was positive correlation between soil pH and the contents of exchangeable calcium and magnesium.
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