Soil structure decline and/or compaction Soil structure decline, also sometimes termed soil structure degradation, refers to the disintegration of topsoil aggregates into primary particles. Soil compaction is a form of physical degradation resulting in densification and distortion of the soil. Subsurface compaction refers to a physical compaction and hardening of the subsurface layer (i.e. 10 … Continue reading Soil Structure Decline and/or Compaction