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A clamp is a compact heap, mound or pile of materials.〔"Cramp, n.3." ''Oxford English Dictionary'' Second Edition on CD-ROM (v. 4.0) © Oxford University Press 2009〕 A storage clamp is used in the agricultural industry for temporary storage of root crops such as potato, turnip, rutabaga, mangelwurzel, sugar beet etc. A clamp is formed by excavating a shallow rectangular depression in a field to make a base for the clamp. Root crops are then stacked onto the base up to a height of about 2 metres. When the clamp is full, the earth scraped from the field to make the base is then used to cover the root crops to a depth of several inches. Straw or old hay may be used to protect the upper surface from rain erosion. A well-made clamp will keep the vegetables cool and dry for many months. Most clamps are relatively long and narrow, allowing the crops to be progressively removed from one end without disturbing the remaining vegetables. The use of a clamp allows a farmer to feed vegetables into market over many months. ==See also== * Food preservation * Root cellar * Brick clamp * Charcoal clamp 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Storage clamp」の詳細全文を読む スポンサード リンク
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