Improved nutrient availability
Worms love dead roots, leaves, grasses, manure and soil. Their digestive system concentrates the organic and mineral constituents in the food they eat, so their casts are richer in available nutrients than the soil around them. Nitrogen in the casts is readily available to plants. Worm bodies decompose rapidly, further contributing to the nitrogen content of the soil.
Worm casts release four times more phosphorus than standard surface soil. Plants love them too as they are a brilliant environment for root growth, they can also help roots penetrate deeper to more nutrients and moisture.
By burrowing in the soil, worms loosen and aerate the soil and greatly improve soil drainage. Soils with earthworms drain up to 10 times faster than soils without earthworms. In zero-till soils, where worm populations are high, water infiltration can be up to 6 times greater than in cultivated soils.
Improved soil structure
Worm casts help to rebuild topsoil, they can also store moisture without it dispersing - greatly benefitting plants.
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