Characteristic of Magnesium Content in Flue-Cured Tobacco Leaves and Exchangeable Magnesium Content in Soil of Baise Tobacco-Growing Areas

The soil and tobacco leaf samples were collected from tobacco-planting counties in Baise city of Guangxi,and the contents and characteristics of magnesium(Mg) in tobacco-planting soils and tobacco leaves were studied to provide references for balancing the fertilization and the development of high-quality and special tobacco leaves.The results showed that the exchangeable magnesium contents in tobacco-planting soils were relatively low with an average of 0.84 cmol/kg.The magnesium contents of more than 50% soil samples from all tobacco-planting counties were found in the range of 0.5-1.0 cmol/kg.The magnesium content in tobacco leaves was found to be low with an average of 0.17% and 30% degree of variation,and that collected from most of the tobacco-planting counties was found to be deficient.The magnesium content of 80% tobacco leaf samples collected from Jingxi,Debao,Lingyun,Xilin county was deficient.Therefore,applying magnesium-containing fertilizers must be recommended for tobacco growing areas of Baise city to improve the tobacco yield and quality.