Earthworms are the most efficient composters in nature and what they do to the soil and leave in the soil is what every gardener strives to achieve. A natural, chemical free soil that is well conditioned and biologically fertile. Good soil will produce good food! And good food has a dramatic impact on good health.
Researched Information about the importance of earthworms. Most is from 'Biology & Ecology of Earthworms' by C.A.Edwards and P.J.Bohlen
It has been proved conclusively that earthworms aid soil fertility!
Adding earthworm casts to soil can improve its structure and fertility greatly!
It has been suggested that earthworms are excellent bioindicaors of the relaive health of soil ecosystems.
Pig solids are probably the most productive wastes for growing earthworms.
Eisenia fetida species is the most commonly used worm for management of organic wastes.
Eudrilus eugeniae (African Crawler) has high rates of reproduction and is capable of decomposing large quantities of organic wastes rapidly, but must be kept warm.
Earthworms improve soil aeration by their burrowing acivities. This means that water infiltration is from 4 to 10 times faster in soils with earthworms than in soils without earthworms.
There is good evidence that materials produced by earthworms can promote the growth of plants.