This guide focuses on the remediation of compaction through subsoiling. When properly done, subsoiling loosens the soil allowing roots to penetrate deeper into the profile, increasing the depth of water infiltration, and improving conditions conducive to biological activity. It is therefore the starting point for the alleviation of compacted soils. However, subsoiling is a complex and expensive operation which must be well planned and executed in order to achieve the desired results. Problems caused by improperly executed subsoiling may outweigh the benefits. In order for this operation to be successful it is important to understand both the optimal field conditions for subsoiling and the basic mechanics involved.