Overview

For successful and efficient fertilization of soils for agricultural plant production, the determination of the neutralization effect of agricultural limes is very important. This European Standard EN 12945:2014+A1:2016 specifies two methods for the determination of the neutralizing value (NV) of liming materials. Method A is applicable to all liming materials except silicate liming materials. Method B is applicable to all liming materials. The sample is dissolved in a specified quantity of hydrochloric acid standard solution. The excess acid determined by back titration with a sodium hydroxide standard solution. Both methods do not correctly take into account the potential neutralizing value of material containing more than 3 % P2O5. For a more accurate agronomic assessment of products containing more than 3 % P2O5 the liming efficiency is determined according to EN 14984. The now incorporated Amendment 1:2016 takes into account the possibility of specifying the results of the neutralization value as HO-equivalent. The newly added Annex B contains corresponding conversion tables (CaO to HO- or HO- to CaO). The standard has been prepared by Technical Committee CEN/TC 260 "Fertilizers and liming materials" (secretariat: DIN). The national Mirror Committee is Working Committee NA 057-03-02 AA "Düngemittel" ("Fertilizers") at DIN Standards Committee Food and Agricultural Products.

Document: references other documents

Responsible national committee

NA 057-03-02 AA - Fertilizers  

Responsible european committee

CEN/TC 260/WG 3 - Liming materials