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Don't know how widely regarded ol' jorge cervantes is on this site for viability, but I came across this in his indoor bible (my first resource when I am in doubt).....
Foliar Feeding
Virtually all liquid foliar fertilizers including fish emulsion, conain nitrates. the leaves of cannabis convert nitrates to carcinogenic N-nitrosamines! This is why I can no longer reccomend foliar feeding to "green up" a garden.
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