Application of Ground Phosphate Rock to Diminish the Effects of Simulated Acid Rain of Soil Properties

The effects of simulated acid rain retained in soil on the properties of acid soil and its diminishing by application of ground phosphate rock were investigated by using the sorption method.Results show as follows:(1)For yellow brown soil,the effect of simulated acid rain on the properties of soil with a pH value of 5.9 was relatively small,except a great quantity of acid rain deposited on it.(2) for red soil,the effect of simulated acid rain on the properties of soil was significant.With the increase of the amount of acid deposition,the pH value of soil was declined,but the contents of exchangeable H^+,Al^3+ and Mn^2+ and the amount of SO4^1- retention were increased.(3) Many properties of acid soils could be improved by applying ground phosphate rock.For example,pH value of soils and the amounts of available P and exchangeable Ca^2+ and Mg^2+ were increased,and the amounts of exchangeable H^+ and Al^3+ and SO4^2- retained was reduced.The application of ground posphate rock could effctively diminish the pollution of acid rain to soil.