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Silage Making

Silage is the fermented product of an agricultural crop, and a silo is any formal or informal storage structure for silage, everything from a bunker to a covered pile. If the structure limits oxygen, and the forage has sufficient water soluble carbohydrates, primarily lactic acid bacteria will ferment the sugars to lactic acid and other organic acids. Grass is not the perfect substrate for silage, compared to something like corn silage. Grass does tend to have lower buffering capacity than alfalfa and can also have higher concentrations of water soluble carbohydrates, which both translate to a quicker acidification during ensiling. Under good ensiling conditions pH will drop to 4 or below, at which time fermentation ceases and the silage is stable in storage.