以不同处理的腐植酸肥料为对象,通过室内模拟淋溶实验研究了氮素淋溶情况。结果显示,添加腐植酸的复混肥料,特别是经脲基活化处理后,氮素在土壤中的淋失量明显降低,后期土壤氮素残留量显著高于无腐植酸和未活化腐植酸肥料。经活化处理后的腐植酸对氮素具有一定的缓释效果,显著提高了养分利用率。 Taking different treatments of humic acid fertilizer as object, the leaching situation of nitrogen was studied by indoor simulated leaching experiments. The results showed that the humic acid compound fertilizers, especially the urea-based activated sludge treatment, the leaching loss of nitrogen in the soil was significantly reduced, and the residual nitrogen content in the late soil was significantly higher than that of the non-humic acid and unactivated humic acid fertilizer . The activated humic acid on the nitrogen has a sustained release effect, significantly increased nutrient utilization.