Effect of Acid Rain on Leaching Loss of Nitrogen and Phosphorus

Using the soil columns leaching experiment,the dynamic change characteristics of leaching loss of nitrate nitrogen and phosphorus in the Purpli-Udic Cambosols soil affected by acid rain with different fertilizers were investigated.The results showed that the leaching loss of nitrate nitrogen in the soil was far more than that of phosphorous.The leaching loss of both was obviously influenced by the amount of fertilizers and acid rain and can be shown in the order of Organic manureFertilizerOrganic manureControl check treatment.The loss of nitrate nitrogen and phosphorus increased with the amount of fertilizers increasing and mainly occurred in the rainy season.Under the same kind of fertilizer,the loss of nitrate nitrogen increased as the pH values of rain rose.However,the 5.5 of pH value was a critical point for the loss of phosphorus when there was the largest amount of available phosphorus in the soil and the loss came to the head.