Earthworms Count: How Healthy is Your Soil?

One of the earthworms found in a soil sample in Shropshire

By Jeremy Lelean, Geography and Environmental Science, University of Reading

Soil, from being an overlooked area of research, is now considered an area of vital interest in the solution to many of the global problems of we currently face. A key idea of how to manage our soil is the notion of soil health, which was referred to regularly in the newly published DEFRA Twenty-Five Year Environment Plan.

Measuring soil health, however, is a vexed question as there are a number of potential indicators that can be used. One of these is earthworm numbers, but numbers alone may not give a good picture of soil health overall. As part of the Soil Security Programme, fellow Dr Jackie Stroud has developed a method that is more indicative of soil health than simple earthworm numbers.

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