Green roughages are plant materials with a high moisture content, such as grasses in pastures and root plants, including sugar beets, turnips, and rutabagas.
Tubers such as potatoes are also a green roughage.
Silage is the feed that results from the storage and fermentation of green crops. The fermentation takes place in the absence of air. Corn silage is the most important member of this group. Other examples are grass, legume, and small grain silages.