Abstract
The earthworm Lumbricus terrestris makes deep vertical burrows in the soil and feeds overnight on organic material at the soil surface. Previous experiments showed that about 2 ton of organic matter dry weight, representing 100 kg of N, could be incorporated in the soil per year by earthworm populations of 1000 kg ha−1. Earthworm burrowing furthermore provides channels for root growth, water infiltration and aeration.
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