how do earthworm increase the fertility of the soil
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Earthworm burrows increase soil porosity which increases the amount of air and water that get into the soil. Increased porosity also lowers bulk density and increases root development. Earthworm excrement or casts increase soil fertility because it contains nitrogen, phosphorus, potassium, and magnesium.
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the earth worm skin contains some moisture content it helps to fertilize the soil
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