These removed organics represent a dry matter loss. The reduction in organic acids causes the pH to rise. The higher pH makes the silage more easily decomposed by microbial activity. Percolating water can also transport oxygen into the silage. The oxygen supports microbes which cause silage deterioration.
Microbial deterioration is called gaseous dry matter loss.
The effluent and gaseous dry matter losses are not visible to producers, so they are not aware of the magnitude of the loss. The following cover systems were applied. Exposed to the atmosphere. No cover touching the silage. Structural roof shed rain from bunker.