Benefits of Worms and their castings have long been known, and here is one example from Thomas J. Barrett”s Harnessing The Earthworm.
In a full-column article entitled “Earthworms in Role of
Great Benefactors of the Human Race,” Mr. W. A. Anderson,
Editor of the South Pasadena Review, reported a number of
growth experiments by the author.* One of the experiments reported
on was this: We planted three boxes of lawn grass (poa
trivialis}. One box of good native soil as control; one box of
identical soil, but with earthworms added ; one box of pure earth worm
castings. After germination and sixty days’ growth, the
grass was harvested and the results carefully compared. All
boxes produced good crops of grass. The box of native soil, with
earthworms added, yielded 271 percent more than the control box
without worms. The box of earthworm castings yielded 463 percent
more than the control box without earthworms.
Texas Jumpers 
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