Distribution of Soil pH and Correlation to Soil Nutrient in Tobacco-planting Arcas of the Southeast of Chongqing

To provide a scientific basis for balanced fertilization and improving soil setting,the authors used the method of GPS location system to take soil samples.The distribution of soil pH and the correlation to soil nutrient were analyzed from 131 soil samples which were collected from the typical tobacco-planting county Pengshui and Wulong in southeast of Chongqing.Results:Tobacco-planting soil acidification in southeastern of Chongqing is serious,and the most suitable tobacco grown soil pH5.5~6.5 accounted for only 36.36%;There are significant differences in content of soil available elements in the southeast of Chongqing.The content of available boron,molybdenum is extremely low;It is suitable of water-soluble chlorine content;And the content of nitrogen,exchangeable magnesium is suitable or rich;However,the content of phosphorus,exchangeable calcium are different,and the distribution of proportion in all levels is well-balanced;Soil pH-value was highly significantly negatively correlated with the content of soil available phosphorus,nitrogen,Cu,Zn,iron pH-value,and highly significantly positively correlated with the content of exchangeable Ca,magnesium;Compared pH≤4.5 with 5.5 pH≤6.5,the content of soil organic matter,available nitrogen,K,iron,Zn,Cu,Zn is higher.However,the content of water soluble chloride,available manganese,exchangeable calcium,magnesium is lower.