How do heavy farm machines compact soil and affect water absorption?

Heavy farm machinery contributes to soil compaction, particularly through the formation of a "hardpan" or "plow sole"—a dense, compacted layer located just beneath the depth typically disturbed by tillage. As the level of mechanization increases, the prevalence of these compacted layers often rises.1

This compaction negatively impacts soil health by altering its physical structure. Healthy soil requires a network of large, stable pores that extend from the surface to the subsoil to facilitate the rapid infiltration and drainage of water. When heavy machinery compresses the soil, these essential pores are destroyed or restricted. Consequently, the soil's ability to absorb and transmit water is significantly reduced, which can lead to poor drainage, inhibited root development, and limited access to subsoil moisture. To restore productivity, farmers must often use mechanical means to shatter these compacted layers, allowing water to be stored effectively for future crop cycles.1