Story: Earthworms

Earthworm casts

Earthworm casts

Earthworms excrete material known as casts. These may be laid in the soil, where they add to soil mixing, or at the soil surface. Surface casts are usually deposited by earthworms that form vertical burrows. The casts are very fertile, containing digested soil and plant material, and microbial agents that continue to transform nutrients. They are usually high in phosphorus, nitrogen and potassium.

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Photograph by Emily Tutaki

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How to cite this page:

Gregor Yeates, 'Earthworms - Earthworms and soils', Te Ara - the Encyclopedia of New Zealand, (accessed 14 June 2024)

Story by Gregor Yeates, published 24 Nov 2008