Disk Harrow blade angle
I have a Hay King disk harrow and there is the option of changing the angle the blades attack the soil from almost a straight line entry to quite an offset entry. The plough was delivered with the blades at the most offset setting and I am finding that with the dry conditions it barely breaks the surface of the soil. What are the pro's and cons of the different angle options ?
Disc harrows are designed so that you can adjust the angle for the job you are wanting the implement to do. The greater the angle, the deeper the discs will cut into the soil. If the implement is adjusted to have very little angle, the discs will cut lighter and shallower. It is best to find the optimum angle for your implement, and leave at that setting. Many factors will go into this, such as disc size and concavity.
Hmmm, this is counter intuitive, surely the disc will go deeper if parallel to the direction of travel, but cut the earth up more if angled ???????
You are correct. The discs could physically go deeper into the soil at a lesser angle. But, they will create smaller furrows, while moving less soil. However, at a greater angle, the discs will attack the soil more aggressively. This creates a larger furrow, and turns more soil over in the process. Thus creating more soil pulverization. Ideally, a medium angle can be used for multiple field applications and variables. Just be sure that the rear discs are angled correctly to cover the furrows left by the front discs. This will leave a smoother finish behind the implement. You may also add additional weight to the front of the implement, which will help in getting the discs to cut deeper into more compact soils.