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> Unless surface to capture rainfall is clean, it can be contaminated with animal droppings.

Your going to have a bad time when you find out what most organic fertilizer comes from.

Heh, sure... but hopefully not with unneutralized disease carrying pathogens.

The only neutralization cow shit gets is the sun beating down on it and the microbes within it decomposing it. Cow and other herbivore shit is unlikely to make you sick though, it is incredibly well digested.

Well, horse shit is incredibly poorly digested, so poorly that it's basically just stinky straw, but I never got sick from using it as fertilizer either :)

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