The harrows can be used as a separate unit coupled to the tractor or at the same time as other work to harrow the soil by placing several attachments and trailers on the tractor, in particular with a plow and a cultivator. It's all about choice. And the choice of tool is an archival issue. Since harrows are divided into light, medium and heavy depending on their weight, then the power characteristics of the tractor will tell you which type to choose. However, it is more important to choose the right type of device.
Types of working bodies of harrows
There are only four of them, here they are:
- Disc harrow - its working bodies are made in the form of disks, located at an angle to the direction of movement of the unit - this is the angle of attack. Adjusting the depth of harrowing changes the angle of the disk. The principle of action in loosening the soil and cutting the turf, which is most needed before sowing, because the top is mixed with the bottom layer of soil, and the roots of weeds are crushed.
- Tooth harrow - the working bodies have the shape of teeth, and the cross section can be both round and square. If they cut the soil with their front part, they grind its lumps with their side parts. The soil is mixed to a depth of 10 cm. This type of harrow is often used in conjunction with cultivators or drills.
- Spring harrow - used after sowing and after harvest. Its spring tooth can have different cross sections. And the spring harrows themselves are mounted, semi-mounted and trailed. In addition to harrowing, they are suitable for fertilizing and rolling straw.
- The needle harrow is a special unit used in anti-erosion tillage. It also destroys the ice crust over the winter. Needle harrows will be needed for tillage during the closure of soil moisture in the spring and for smoothing the uneven surface of fields that have arisen from other tillage.
Learn more about important details
First of all, disc harrows are divided into sectional and with an individual rack. In the first disks are on the same shaft in the form of a "battery" - this model is cheaper, but it is more difficult to maintain due to the inaccessibility of parts. The same reason for the intensive winding of plant prunings on the shaft. Models with individual racks or disc harrows make it easy to lubricate, repair or replace work tools, as each disc is attached to an individual rack. In general, disc harrows may have a different number of discs in a row, their different shape and diameter, and therefore the harrows may have different functions.
Usually the harrow with disks on individual racks has from 2 to 4 rows. The following are the fundamental differences between them:
|Double row harrows
|When working tools are arranged with a pitch of 270 mm, and with a row spacing of 800 mm, the implement does not become clogged with crop residues, and the working width and productivity are larger.
||Requires less traction than 4-rows, so larger tine discs can be used, reducing the number of passes while using less energy
||They have more operations - loosening, crumbling, chopping crop residues and leveling the field relief. And also more qualitatively process heavy soils.
And yet, lightweight models allow harrowing on very moist soils, but do not cope with the remnants of corn or sunflower. Medium harrows (disc harrows) allow you to perform two operations simultaneously, by adjusting the depth of cultivation, but with excessive clogging of crop residues or its long idle power harrow is not enough and requires re-passage of the harrow. Heavy harrows will easily cultivate fields with dense soil and increased weed infestation, but their working bodies are intensively stuck to moist soil, which leads to stops for cleaning them.
The quality of tillage is also affected by the angle of attack - the angle of installation of the disks. So it is better to set the front row at 16 degrees, and the back - at 14. Although the best angle for pruning will be 20 degrees. Recently, however, manufacturers often produce harrows with a fixed optimal angle, which facilitates the maintenance of machinery by farmers and makes breakdowns in this part of the harrow rare.
Selection of harrows for specific tasks
The type of harrow depends on the crops grown in your fields. If the stubble is half-shredded, light harrows will be able to harvest it. Then after corn or sunflower - only heavy models. However, when there is a rainy season after cleaning, it is better to do the work with a light harrow, but in two passes, so that the heavy unit does not bind in wet soil. And for effective destruction of weeds by a mechanical way apply 2-row harrows with systems of rollers.
Other types of harrows
In toothed harrows, the differentiation follows the force of pressure on the tooth, which determines the type of soil suitable for treatment with the following harrows:
|Type of harrow by weight
||Tooth pressure and depth of treatment
||Field types to process
||2-3 kg, up to 5-8 cm deep
||for clay and loamy soils
||1-2 kg, up to 4-6 cm deep
||for light and loose soils
||0.5-1kg, up to 2-3cm deep
The use of spring harrows is effective for loosening and leveling the surface layer of the soil. The action of spring harrows is based on vibration, which makes the operation more accurate, without causing damage to plants during harrowing.
For complete information on a specific harrow model, you need to contact a representative of the supplier company and make the right choice.