ONORM L 1088-1993 Chemical analysis of soils - Determination of plant-available phosphate and potassium by calcium-lactate-hydrochloric acid-method (DL-method)
1993ONORM L 1088-1993 Chemical analysis of soils - Determination of plant-available phosphate and potassium by calcium-lactate-hydrochloric acid-method (DL-method)