silo

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silo

an airtight and insect-proof container used to store agricultural products and to make ensilage. May be made of concrete, rarely of brick, or of glass-lined steel or be a hole dug in the ground, or two parallel barricades lined with plastic. Those used for grain storage need only to be insect-proof and airtight. Those used for ensilage making need also to be resistant to the corrosive effect of the acids produced during anaerobic fermentation. See also ensilage.

silo gas
nitrogen dioxide.