The relationship of dry matter content and acidification
There is a direct relationship between pH and dry matter (DM) of silages.
Undesirable silage spoilage microorganisms (e.g. clostridia, coliforms, listeria, etc.) are inhibited or killed by low terminal pH. The microbial growth is also linked to the water activity of the forage, which means that a certain level of water is needed from the microbes to grow. The water level has a direct impact with the final pH inhibition.
The higher the dry matter content is of the forage, the higher will be the pH needed to inhibit undesirable spoilage microorganisms and vice versa.