For me, tiny seedlings get 600ppm, when 4-12 inches or so they get 1200ppm. By the 4th flower truss I am cranking at 1600-1700ppm until the end. This is just a guideline I follow that I got from Hydro Gardens. To check the accuracy I send in leaf samples to Servi Tech labs, my reports have been good in the past.
You will get lots of opinions on this, like everything else, but this is mine and why I came to these conclusions.
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