As to fertilizer toxicity- the biggest worry that I am aware of
would be the nitrates. People don't handle nitrates too well, and infants
are most susceptible. Look up "blue baby disease" or "blue baby syndrome,"
also known as methemoglobinemia.

Actually, methemoglobinemia has a number of causes, nitrates in
the diet being one of several.

Other'n that, most of the components are fairly safe in the
concentrations at which they would most likely be present.

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-AJHicks
Chandler, AZ