C
critical
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is rock guano a good additive to mix with your bat guano if using?
FYI
guano=poop. usually from a bird or a bat. otherwise it would be manure, castings etc. They're all poop, shit, doodoo, #2, etc.
soft rock phosphate is a very good choice for P. so is fish bone meal and bone meal as well as the high P guanos.
Some people will grind up the "pellets" of the soft rock phosphate to make them available quicker.
mrb