The ability to penetrate the soil.
Some drags have beams with a variable angle of inclination, which determines the ability of the beam to sink into the soil. Such drags are more versatile and can be used in various soil conditions without the need for additional loading. The angle of attack cc of the beam can be set within the range of 60 ° -120 ° [1,05—2.10 rad]. On more compact soils, harrows are used, which have one bar with teeth.
Trawls are attachments. They can be pulled by horses or by lighter tractors. On lighter and medium soils, the draglines are directly aggregated with the plow for sowing. Their task is to level the surface of the plowed soil for sowing seeds. Regardless of the factory-produced fibers, there are also economically-made fibers on the farms. Usually, various wooden beams are used for this purpose, old car-wheel rims or sections of narrow gauge railways.