Soil Physicochemical Properties and Planting Years Affect Chemical Composition of Tobacco Leaves in Hengyang
To comprehensively analyze the soil physicochemical properties and tobacco quality in Hengyang City,we collected soil samples and tobacco samples from the representative tobacco fields with purple paddy soil in five tobacco-planting counties(cities)of Hengyang.The effects of soil physicochemical properties and planting years on the chemical composition of tobacco leaves in different areas were studied,and the quality of tobacco leaves was evaluated.The results showed that the purple paddy soil in the tobacco field in Hengyang generally had moderate or rich organic matter(96.3% ),moderate or high available nutrients(88.9%-94.4% ),and neutral pH in 68.5% of the sampling sites.The tobacco leaves in Hengnan County,Hengyang County,Leiyang City,and Changning City had low total nitrogen(<1.5% ),and those in Hengyang County and Changning City had low nicotine content(<1.5% )and sugar-alkali ratio(<8% ).The tobacco leaves in Hengnan County had low reducing sugar(<18% ),and those in other counties and cities had high total water-soluble sugar(>22% ).The correlation analysis showed that the phosphorus and potassium content in soil and microbial biomass were the main factors affecting the quality of tobacco leaves.The soil after 10 years of tobacco planting showcased decreased percentage of agglomerates with the particle size>2 mm and increased percentage of agglomerates with the particle size<2 mm.The decreases in soil total nitrogen,organic matter,and microbial biomass and the destruction of physical structure of the soil after over 10 years of tobacco planting negatively affected tobacco quality.Therefore,it is suggested that the application of chemical fertilizer should be reduced in the tobacco soil with high total nutrients,and organic fertilizer can be applied in the tobacco soil with low organic matter and serious destruction of soil agglomerates,which is of great significance for improving the soil quality and tobacco quality in Hengyang.
Hengyangtobaccosoil physicochemical propertieschemical compositionplanting years
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万方数据
