The leaching of non-point source N and P from latosol in dry land of Leizhou peninsula

The non-point source nitrogen and phosphorus loss and environmental pollution hazards due to the application of large amount of fertilizers have been increasingly emphasized. The leaching characteristics of nitrogen and phosphorus fertilizers and their effects on ground water quality were investigated through soil column nitrogen and phosphorus leaching experiments. The results indicated that the leaching concentration of ammonia nitrogen and total nitrogen were related to the quantity of nitrogen fertilizer input, however, the diverse ranges of the nitrate concentration were large, and the conformation of leaching nitrogen mostly was NO3--N. The leaching of total phosphorus was less because phosphorus was difficult to release. The input of nitrogen and phosphorus fertilizers together have influence on the non-point source nitrogen and phosphorus leaching, and excessive application of phosphorus fertilizer can increase the leaching of NH4+-N, NO3--N, and TN.