Worm casts
Coils of fine, digested soil left on the surface by earthworms. Scattering casts with a broom is preferable to treating lawns to kill the worms, as their earth-moving activities aid soil drainage and aeration.
After four or five months the worm casts or vermicast on the bottom level will be ready to use. It's powerful stuff.
When the soil is not too dry or wet, examine the soil surface for earthworm casts and/or burrows. Then dig out 6 inches of soil and count the number of earthworms squirming on the shovel. Three worms are good, five are better.
Materials eaten by earthworms passes through their bodies and are excreted in a form known as earthworm casts. The casts, as compared to the original soil, are higher in nitrogen, organic matter, magnesium and available phosphorus.
 See also: Water, Plant, Growing, Gardener, Grow
  
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