Often there is only one harvest time a year, this implies a long storage time for grains. Storage conditions, moisture content, external weather factors and preventative measures must be considered when storing grains. After the harvest and during storage, grains face mainly microbial degradation in the form of mould growth. The main concerns are post-harvest mycotoxin production, decrease of macro nutrients and reduced palatability. Treating grains with a blended organic acid before short- and long-term storage helps prevent grain mould and bridging of the grain.