Castings come through worm. Vermicompost has
castings in it, but can and usually does contain considerable organic matter
that has not been through the worm. You really need to be extra, extra careful
handling some of this as there is a disease known as organic dust toxic syndrome
(ODTS) which can result in airway irratation, stomach and intenstinal
problems.....a dust mask will help.
Testing is important. Know your source. There is
some great worm vermicompost out there and some bad vermicompost. Also, you have
to consider diversity.
Cheers,
Jeff
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