[FONT=Arial, sans-serif]The first number indicates the NITROGEN content measured as % N.[/FONT]
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[FONT=Arial, sans-serif]The second number indicates the PHOSPHORUS content measured as % P2O5[/FONT]
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[FONT=Arial, sans-serif]The third number indicates the POTASSIUM content measured as % K2O[/FONT]
[FONT=Arial, sans-serif]You want lots of nitrogen for VEG stage, and lots of Phosphorus for flowering. [/FONT]