淋洗法测试肥料氮素释放性能研究

Research in Nitrogen Release Characteristics with Leaching Method

分别采用水浸泡法、间歇淋洗法和连续淋洗法测试肥料氮素释放性能,考察了不同模拟土壤介质的淋洗结果,并从介质饱和含水率、水分张力和阳离子交换量等方面综合分析了模拟土壤效果。实验表明:水浸泡法与无介质连续淋洗法结果具有良好的相关性,都符合y=ax+b释放模型;相同介质间歇淋洗法和连续淋洗法结果具有良好的相关性,都符合N=N0/[1+exp(A-kt)]释放模型;蛭石+土壤(体积比1∶1)能更好地模拟土壤性能。模拟土壤连续淋洗法可用于肥料生产企业在线检测。

The nitrogen release characteristics was determined by the ＂immersed in water＂ , ＂intermissive leaching＂ and ＂continuing leaching＂ method respectively. The leaching results by using different synthetic soil media were analyzed The results showed that the ＂immersed in water＂ and had a good relativity with continuing leaching without media, and they both fitted to ＂y=ax＋b＂ release model. The results under same media by ＂intermissive leaching＂ and ＂continuing leaching＂ had also a good relativity, and they both fitted to ＂N=N0/[1＋exp（A-kt）]＂release model. Vermiculite＋peat （volume-ratio 1：1） could simulate the characteristics of soil. Continuing leaching under synthetic soil could be used to test fertilizers＇ quality online.