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hilling
Hilling, earthing up or ridging is the technique in agriculture and horticulture of piling soil up around the base of a plant. It can be done by hand (usually using a hoe), or with powered machinery, typically a tractor attachment.
Hilling buries the normally above-ground part of the plant, promoting desired growth. This may encourage the development of additional tubers (as with potatoes), force the plant to grow longer stems (leeks), or for some crops (chicory, leeks, asparagus etc.) this blanching technique keeps the stems or shoots pale and tender, or influences their taste.
Hilling may also be used to stabilize the stems of crops which are easily disturbed by wind.
==Example==
A common application of hilling is for potatoes. The tubers grow just below the surface, and can produce chlorophyll and solanine if exposed to light (green potatoes). Solanine is toxic in large doses, and can result in nausea, headache, and in rare cases, death. By hilling one or more times during the growing season – effectively, burying the potatoes in an additional few inches of soil – yield is improved, and the harvest remains edible.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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