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Plant biostimulants. Determination of the yeast and mould content
This document specifies a horizontal method for the enumeration of *yeasts and moulds* present in plant biostimulants intended for use in agriculture, by means of the colony count technique after aerobic incubation at 25 °C ± 2,5 °C.
This document allows the enumeration of yeasts and moulds, in technical and formulated plant biostimulants, both in liquid and solid states. The method is applicable to microbial plant biostimulants except those composed of fungi or yeasts. If necessary, yeasts and moulds enumerated can be identified using suitable identification tests.
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:
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.
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