Characteristics and Correlation Analysis of Soil Nutrients in Plow Layer of Different Tobacco Planting Areas in Sichuan

In order to explore the characteristics of soil nutrients in different tobacco-growing areas in Sichuan, 10 tobacco-growing areas including Huili County, Yanyuan County, and Yanbian County in Sichuan were selected, to measure soil bulk density, penetrationresistance, pH, organic matter, total nitrogen, total phosphorus, total potassium and other physical and chemical properties of the cultivated layers in different tobacco-growing areas. Soil nutrient characteristics and correlations in different tobacco-growing areas were analyzed. The results showed that:(1) The average soil bulk density of the cultivated layer in different tobacco-growing areas was 1.10-1.38 g/cm³, and the difference between tobacco-growing areas was not significant; the average soil penetration resistance of 0-20 cm was 223.82-1 235.13 kPa. (2) The total nitrogen and alkali-hydrolyzable nitrogen in the cultivated layer of Sichuan tobacco areas were generally at a suitable level, total potassium in the soil was at a deficient level, and available phosphorus, available potassium, exchangeable calcium, and magnesium were at a suitable and abundant level. Among them, the soil pH in Yanbian County and Dechang County was neutral and acidic, the soil total potassium and total phosphorus content in Gulin County and Xuyong County were low, and the soil exchangeable calcium and magnesium content in Dechang County were low. The soil organic matter, total nitrogen, and alkaline nitrogen content in Yanyuan County and Huidong County were low, the total potassium content in Dechang County was excessive, the exchangeable magnesium content in Yanbian County and Huili County was excessive, and for soil in Miyi County and Dechang County, the contents of available phosphorus and available potassium were relatively high. (3) Correlation analysis showed that soil pH was significantly correlated with exchangeable calcium, available phosphorus, and soil organic matter with total nitrogen and available nitrogen.