Two-row modernised disc harrow BDM with a bearing unit inside the disc sphere, with discs on an individual stand, with changing the angle of attack of discs synchronously in each row, is designed for surface tillage to a depth of 15cm, weed killing and shredding crop residues. Due to uniform mixing of earth with crop residues, the disc harrow is effective on soils subject to wind and water erosion. Plant residues, evenly mixed with the topsoil, protect the soil from blowing out and leaching and improve air exchange. At the same time, plant residues in the ground are actively transformed into humus, increasing soil fertility.
The main advantages of 2-row BDM harrows in comparison with 3- and 4-row implements:
- The distance between discs in a row at two-row harrows 300mm, the distance between rows of discs 1000mm. Disc overlap is not complete in double rows. Spaces between discs are processed by tearing off and displacement of earth by the disc of the second row into the furrow formed by the disc of the first row. This does not always happen. However, with the second pass diagonally to the first, the field is processed perfectly: the faults of the first pass are cut off and the ridges on the bottom are cut off. And since the working width of twin-row implements is larger with the same number of discs, their productivity is higher and fuel consumption per cultivated area is lower.
- The length of twin-row implements is much shorter. Therefore, twin-row implements are more manoeuvrable and have smaller swaths. For the same reason there are a lot of mounted implements among twin-row implements - less load on the tractor linkage. Mounted twin-row implements are much cheaper, simpler and more manoeuvrable than trailed implements.
- Due to the smaller distance between discs in a row, the passability of double row implements on a clogged field and in high humidity is less than that of 3- and 4-row implements. However, for the same reason, the field surface is less ridged after the twin rows have passed. That is why it is better to use the twin rows at a shallower depth, for timely cultivation in fields with low weediness and for pre-sowing cultivation.
- The use of angle of attack adjustment makes the BDM twin-row harrow the most versatile implement. By increasing the angle of attack and at a relatively low speed, it is possible to cultivate the field deep enough without any faults. With decreasing angle of attack and at high speeds, the field can be cultivated to a shallow depth and in two passes immediately under sowing.
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