Advertisement

Scientists discover why worms are so good for our soil

Researchers in London have discovered the ingredient that helps earthworms digest leaves.

Until now, scientists and gardeners have not known why earthworms are so good at enriching the soil. But Imperial College London's research has identified molecules which counteract plant toxins.

Researchers say a world without earthworms would be very different. Credit: PA

They've been dubbed "drilodefensins". Drilodefensins allow earthworms to metabolise rotten roots and leaves that other herbivores wouldn't be able to digest - returning concentrated nutrients and carbon to the soil.

Without drilodefensins, fallen leaves would remain on the surface of the ground for a very long time, building up to a thick layer. Our countryside would be unrecognisable, and the whole system of carbon cycling would be disrupted.

– Dr Jake Bundy, lead scientist