By Peter Tomlinson, Environmental Quality Specialist Earthworms play an important role in soil as they redistribute organic matter, influence soil fertility, and affect soil physical properties. While earthworms are not essential for the formation of well-aggregated soil, their presence can contribute significantly to the formation and stabilization of aggregates and improve soil structure. Earthworm casts — the excreted mixture of soil and organic matter — can develop into stable soil aggregates. Depending on the species, the cast material may be deposited in the burrow or . . .
Kansas State University Extension explains how earthworms benefit soil fertility, organic matter and physical properties, and what to do to increase their population.
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