Correlation Between Soil pH and the Contents of Available Nutrients in Selected Soils from Mango Orchards in Panxi

42 soil samples were collected in Panxi mango orchards to evaluate the correlation between soil pH value and available nutrients.Results revealed that the soil pH values of the mango orchards ranged from 4.8 to 8.4,and that the neutral and acidic soils accounted for 76.2%.The contents of soil organic matter,available nitrogen,zinc and exchangeable calcium were extremely low,and the available copper and boron were low.Available potassium was at middle level while available phosphorus,sulfur,iron,manganese and exchangeable magnesium were rich.Soil pH values were highly significantly correlated with the available levels of most nutrients.A high significant negative correlation was found between soil pH values and the contents of soil organic matters,available nitrogen,potassium,copper,zinc,iron and manganese.A high significant positive correlation was shown between soil pH values and available sulfur,exchangeable calcium.No significant correlation existed between soil pH values and available phosphorus,boron and molybdenum.Regression analysis showed that a power function,a linear function,an exponential function and a quadratic function could be used to describe the relationships between soil pH and the contents of organic matter,the contents of available nitrogen,zinc,sulfur,the contents of potassium,copper,iron,manganese,and the contents of exchangeable magnesium,respectively.All correlation coefficients were statistically highly significant.