乙二胺四乙酸(EDTA)或其盐类曾被用于各种土壤的测试方法。Viro已报导用它作阳离子和阴离子的提取剂。与醋酸铵比较,EDTA对吸收性阳离子和磷是一个更为有效的提取剂。利用EDTA提取的离子以估价酸性森林土壤的肥力状况时,Viro发现肥力与Ca,Cu和Zn有良好的相关性,但与Mo和P则无相关性。Alexander和Robertson曾测定了EDTA提取的磷和用其他几 Ethylenediaminetetraacetic acid (EDTA) or its salts have been used in various soil test methods. Viro has reported it as an extractant for both cations and anions. Compared to ammonium acetate, EDTA is a more effective extractant for absorptive cations and phosphorus. Using the ions extracted by EDTA to assess the fertility status of acidic forest soils, Viro found that there was a good correlation between fertility and Ca, Cu and Zn but not with Mo and P. Alexander and Robertson had measured the EDTA extracted phosphorus and used a few other