how do earthworms improve soil texture
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the earth worms improve by Earthworm casts cement soil particles together in water-stable aggregates. These are able to store moisture without dispersing. Research has shown that earthworms which leave their casts on the soil surface rebuild topsoil. In favourable conditions they can bring up about 50 t/ha annually, enough to form a layer 5 mm deep. One trial found worms built an 18-cm thick topsoil in 30 years.
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Earthworms consume some amount of the soil and then it passes through their digestive system and is taken out. This increases the amount of salts, minerals in it.
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