Effects of Simulated Acid Rain on Nitrogen and Phosphorus Leaching Characteristics in Latosolic Red Soils with Application of Organic Compound Fertilizer

A soil column method was applied to study influences of simulated acid rain on leaching characteristics of nitrogen and phosphorus from organic compound fertilizer in latosolic red soil in south China.Results revealed that leaching loss amounts of ammonia nitrogen,nitrate nitrogen,inorganic nitrogen and total nitrogen all decreased with increase of pH values of the simulated acid rain.Inorganic nitrogen and total nitrogen leaching amounts of the pH2.0 acid rain and the control(pH6.5) were not significantly different at p0.05,but were significantly higher than those of pH3.0,pH4.0 and pH5.0 acid rain.Among all the treatments,pH5.0 acid rain had the lowest nitrogen leaching losses.Therefore,both strong acid rain(pH2.0) and neutral leaching water(pH6.5) enhanced nitrogen leaching,while acid rain with acidity close to the soil(pH5.0) caused slightest nitrogen leaching loss.Compared to the control,acid rain had no significant effects on DP leaching,but significantly reduced PP and TP leaching losses.Moreover,no significant differences existed in phosphorus leaching amounts among acid rain of different pH values.So,acid rain had marginal effects on phosphorus leaching in latosolic red soils.Also,no significant effects of acid rain were observed on the dynamics of concentrations and accumulative leaching loss amounts of nitrogen and phosphorus.