- Disc harrow
A disc harrow is a farm implement that is used to cultivate the soil where crops are to be planted. It is also used to chop up unwanted weeds or crop remainders. It consists of many iron or steel discs which have slight concavity and are arranged into two or four sections. When viewed from above, the four sections would appear to form an "X" which has been flattened to be wider than it is tall. The discs are also offset so that they are not parallel with the overall direction of the implement. This is so they slice the ground they cut over a little bit to optimize the result. The concavity of the discs as well as their being offset causes them to loosen and pick up the soil they cut.
In the olden days, disc harrows typically consisted of two sections and which were horse-drawn and had no hydraulic functionality. These harrows were often adjustable so that the discs angle would not be offset so that they could be transported without ripping up the ground as much and so they did not pull as hard.
Disc harrows are primarily used to chop up soil that has been recently plowed to eliminate clumps and loosen the soil if it has been packed. They are also used to chop up old crops, such as cornstalks, to make the land easier to plow and to eliminate clogging in the plowing process.
An offset disc has two rows of discs that are in a line and angled to make a "V" instead of an "X". An offset disc harrow digs deeper in the soil and has larger, often serrated discs and is often referred to as a disc plow.
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disc harrow — ☆ disc harrow n. DISK HARROW * * * … Universalium
disc harrow — ☆ disc harrow n. DISK HARROW … English World dictionary
disc harrow — noun a harrow with a series of disks set on edge at an angle • Syn: ↑disk harrow • Hypernyms: ↑harrow * * * noun : a harrow that breaks up plowed or rough land by means of discs arranged at an angle with the line of draft * * * disc harrow or… … Useful english dictionary
disc harrow — n. harrow supplied with a number of sharp metal disks on edge at an angle on one or more axles … English contemporary dictionary
disc harrow — noun a harrow with cutting edges consisting of a row of concave discs set at an oblique angle … English new terms dictionary
disc harrow — /ˈdɪsk hæroʊ/ (say disk haroh) noun → disc plough … Australian English dictionary
double-disc harrow — noun Etymology: double disc from double (I) + disk, n. : a harrow with two sets of discs so arranged that one set throws soil outward and the other throws it inward called also double action harrow … Useful english dictionary
disc plough — disc harrow or disc plough noun A harrow or plough in which the soil is cut by inclined discs • • • Main Entry: ↑disc * * * disc plough, Especially British. = disk plow. (Cf. ↑disk plow) … Useful english dictionary
Harrow (tool) — In agriculture, a set of harrows is an implement for cultivating the surface of the soil. In this way it is distinct in its effect from the plough, which is used for deeper cultivation. They are commonly called harrows (plural) as they are used… … Wikipedia
disc — n. (also disk esp. US and in sense 4) 1 a a flat thin circular object. b a round flat or apparently flat surface (the sun s disc). c a mark of this shape. 2 a layer of cartilage between vertebrae. 3 a gramophone record. 4 a (usu. disk; in full… … Useful english dictionary