Harrowing
50.8 هزار بار بازدید -
10 سال پیش
-
What is harrowing?Is the act
What is harrowing?
Is the act of breaking up and even off plowed ground using a farm implement called the Harrow.
A Harrow is like A farm implement consisting of a heavy frame with sharp teeth or upright disks, used to break up and even off plowed ground.
Before the invention of the modern tractor, 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 could be changed from their offset position.
Straightening the discs allowed for transport without ripping up the ground; also they were not as difficult to pull.
Modern disc harrows are tractor-driven and are raised hydraulically. Some large ones even have side sections which raise up vertically to allow easier road transport or better storage configurations.
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.
Types
There are four general types of harrows:
I. Disc harrow
II. Drag harrow
III. Tine harrows
IV. Chain harrowing
Harrows were originally drawn by draft animals, such as horses, mules, or oxen, or in some times and places by manual labourers. In modern practice they are almost always tractor-mounted implements, either trailed after the tractor by a drawbar or mounted on the three-point hitch.
I. 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.
II. Drag harrow
A drag harrow, a type of spring-tooth harrow, is a largely outdated type of soil cultivation implement that is used to smooth the ground as well as loosen it after it has been plowed and packed. It uses many flexible iron teeth usually arranged into three rows. It has no hydraulic functionality and has to be raised/adjusted with one or multiple manual levers. It is a largely outdated piece of farm equipment, having been replaced by more modern disc harrows and deeper, stiff-toothed rippers.
Tine harrows are used to refine seed-bed condition before planting, to remove small weeds in growing crops and to loosen the inter-row soils to allow for water to soak into the subsoil. The fourth is a chain disk harrow. Disk attached to chains are pulled at an angle over the ground. These harrows move rapidly across the surface. The chain and disk rotate to stay clean while breaking up the top surface to about 1 inch (3 cm) deep. A smooth seedbed is prepared for planting with one pass.
Chain harrowing can be used on pasture land to spread out dung, and to break up dead material (thatch) in the sward, and similarly in sports-ground maintenance a light chain harrowing is often used to level off the ground after heavy use, to remove and smooth out boot marks and indentations. Used on tilled land in combination with the other two types, chain harrowing rolls remaining larger soil clumps to the surface where weather breaks them down and prevents interference with seed germination.
Is the act of breaking up and even off plowed ground using a farm implement called the Harrow.
A Harrow is like A farm implement consisting of a heavy frame with sharp teeth or upright disks, used to break up and even off plowed ground.
Before the invention of the modern tractor, 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 could be changed from their offset position.
Straightening the discs allowed for transport without ripping up the ground; also they were not as difficult to pull.
Modern disc harrows are tractor-driven and are raised hydraulically. Some large ones even have side sections which raise up vertically to allow easier road transport or better storage configurations.
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.
Types
There are four general types of harrows:
I. Disc harrow
II. Drag harrow
III. Tine harrows
IV. Chain harrowing
Harrows were originally drawn by draft animals, such as horses, mules, or oxen, or in some times and places by manual labourers. In modern practice they are almost always tractor-mounted implements, either trailed after the tractor by a drawbar or mounted on the three-point hitch.
I. 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.
II. Drag harrow
A drag harrow, a type of spring-tooth harrow, is a largely outdated type of soil cultivation implement that is used to smooth the ground as well as loosen it after it has been plowed and packed. It uses many flexible iron teeth usually arranged into three rows. It has no hydraulic functionality and has to be raised/adjusted with one or multiple manual levers. It is a largely outdated piece of farm equipment, having been replaced by more modern disc harrows and deeper, stiff-toothed rippers.
Tine harrows are used to refine seed-bed condition before planting, to remove small weeds in growing crops and to loosen the inter-row soils to allow for water to soak into the subsoil. The fourth is a chain disk harrow. Disk attached to chains are pulled at an angle over the ground. These harrows move rapidly across the surface. The chain and disk rotate to stay clean while breaking up the top surface to about 1 inch (3 cm) deep. A smooth seedbed is prepared for planting with one pass.
Chain harrowing can be used on pasture land to spread out dung, and to break up dead material (thatch) in the sward, and similarly in sports-ground maintenance a light chain harrowing is often used to level off the ground after heavy use, to remove and smooth out boot marks and indentations. Used on tilled land in combination with the other two types, chain harrowing rolls remaining larger soil clumps to the surface where weather breaks them down and prevents interference with seed germination.
10 سال پیش
در تاریخ 1393/03/30 منتشر شده
است.
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