ČSN EN 17712

This document specifies a method to verify that the pathogen Staphylococcus aureus is absent from microbial plant biostimulants. The method is based on the enumeration of coagulase-positive staphylococci in a sample by counting of colonies obtained on a solid medium (Baird-Parker medium) after aerobic incubation at 36 °C ± 2 °C. This document is applicable to all formulations of microbial plant biostimulants in liquid or solid form. This document is not applicable to other fertilizing products. This document is applicable to the blends of fertilizing products where a blend is a mix of at least two of the following component EU fertilising products categories: Fertilizers, Liming Materials, Soil Improvers, Growing Media, Plant Biostimulants and where the following category Plant Biostimulants is the highest % in the blend by mass or volume, or in the case of liquid form by dry mass. If Plant Biostimulants is not the highest % in the blend, the European Standard for the highest % of the blend applies. In case a blend of fertilizing products is composed of components in equal quantity or in case the component EU fertilising products used for the blend have identical formulations, the user decides which standard to apply.