不同施肥土壤对尿素NH3挥发的影响

经过6a长期不同施肥定位试验,使同一土壤形成肥力上的差异,对此土壤进行室内氨挥发模拟试验。研究结果表明,施用等量尿素条件下,不同施肥土壤氨挥发损失具有明显差异,长期施N土壤,可缩短氨挥发时间3～4d,并且可明显降低挥发损失量。长期施用P肥土壤也能降低氨挥发损失量。并且氨挥发损失量与土壤有机质含量显著相关。

Effects of different soil fertilizations on NH3 volatilization of urea

Different position fertilizations were carried out for six years to make the fertility of the same soil differentiae and the soil with differentiated fertilities was used in simulating NH_3 volatilization in laboratory. The results of the simulation revealed that the NH_3 volatilizations from the soil with urea at the same rate by significantly differed, and the long-term nitrogen fertilization could reduce the period of NH_3 volatilization by 3~4 days as well as obviously reduce the NH_3 volatilization. The long-term phosphorus fertilization also could reduce the NH_3 volatilization, and NH_3 volatilization significantly related to soil organic matter.