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Ard (plough)
The ard, ard plough, or scratch plough is a simple light plough without a mouldboard. It is symmetrical on either side of its line of draft and is fitted with a symmetrical share that traces a shallow furrow but does not invert the soil.〔Joseph Needham, ''Science and Civilization in China'', vol. 6 (1984; reprint, Cambridge: Cambridge UP, 2004), 138.〕 It began to be replaced in most of Europe by the carruca turnplough from the 7th century.
In its simplest form it resembles a hoe, consisting of a ''draft-pole'' (either composite or a single piece) pierced with a nearly vertical, wooden, spiked ''head'' (or ''stock'') which is dragged through the soil by draft animals and very rarely by people. The ard-head is at one end a ''stilt'' (handle) for steering and at the other a ''share'' (cutting blade) which gouges the surface ground. More sophisticated models have a composite pole, where the section attached to the head is called the ''draft-beam'', and the share may be made of stone or iron. Some have a cross-bar for handles or two separate stilts for handles (two-handled ard). The share comes in two basic forms: a socket share slipped over the nose of the ard-head; and the tang share fitted into a groove where it is held with a clamp on the wooden head. Additionally, a slender protruding chisel (foreshare) can be fitted over the top of the mainshare.
==Use==
Rather than cutting and turning the soil to produce ridged furrows, the ard breaks up a narrow strip of soil and cuts a shallow furrow (or drill), leaving intervening strips undisturbed. The ard is not suited for clearing new land, so grass and undergrowth are usually removed with hoes or mattocks. Cross-ploughing is often necessary to break the soil up better, where the soil is tilled twice at right angles to the original direction (lengthwise and across). This usually results in square or diamond-shaped fields and is effective at clearing annual weeds. The ard's shallow furrows are ideal for most cereals, and if the seed is sown broadcast, the ard can be used to cover the seed in rows. In fact, the ard may have been invented in the Near East to cover seed rather than till. That would explain why in Mesopotamia seed drills were used together with ards. The ard is most useful on light soils such as loams or sands, or in mountain fields where the soil is thin, and can be safely used in areas where deep ploughing would turn up hardpan or would cause salination or erosion.
Ards may be drawn by oxen, water buffalo, donkeys, camels, or other animals.
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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