[porlw]

Another reason is that farming machinery compacts the soil.

Techniques such as min-till and no-till aim to minimise soil disturbance (to reduce emissions from deep ploughing and improve soil fertility), but to achieve this you really need to make sure the equipment accurately follows the same path through a field every time, so that the area affected by compaction is mimimised.

Not a farmer, I learned this from the youtube channel Harry's Farm.