This document provides an overview of relevant methods for the determination of specific parameters in solid soil improvers, including: — dry matter content; — nitrogen content; — P2O5 (phosphorus pentoxide) and K2O (potassium oxide) content; — chloride content; — copper and zinc content; — quantity. This document is applicable to solid EU fertilizing products classified as PFC 3 and PFC 7 as long as the main function of the EU fertilizing product is classified as PFC 3 of Regulation (EU) 2019/1009 [1].