本文件规定了通过与0.1 mol\/l醋酸铵（pH值为5.5）反应来测定酸性土壤在要求的维护时间内达到目标pH值所需石灰量的方法。由于一般的土壤缓冲系统，该方法适用于所有酸性足以使氢离子从土壤胶体系统中解离以降低缓冲溶液pH值的土壤。注1:该方法来源于加拿大和挪威的研究，见[1]和[2]。注2:附录A给出了回归方程，用以预测欧洲矿物和有机土壤在石灰化后不同时间的pH值维持范围。

This document specifies a method for the determination of the lime requirement of acid soils to target pH levels at requested time of maintenance as determined by reaction with 0,1 mol/l ammonium acetate pH 5,5. Due to general soil buffering systems, the method is applicable to all soils which are acid enough to dissociate hydrogen ions from the soil colloid system to depress the pH of the buffer solution. NOTE 1 The method originates from research in Canada and Norway, see [1] and [2]. NOTE 2 Annex A gives regression equations to predict the maintenance of a range of pH levels at different times after liming in mineral and organic soils in Europe.