NPK ratios for growth phases: seedlings 1-1-1, vegetative 3-1-2, early flowering 1-3-2, late flowering 1-3-3 — plus calcium and magnesium throughout.
Optimum NPK ratios change: seedlings 1-1-1, vegetative 3-1-2, early flowering 1-3-2, late flowering 1-3-3. Calcium and magnesium are constantly important (Ca:Mg = 3:1). Adjust EC values accordingly: seedlings 0.4-0.8, vegetative 1.2-1.6, flowering 1.6-2.2. Avoid over-fertilisation - less is often more.
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