Control nutrient concentration correctly
EC (Electrical Conductivity) measures dissolved salts in mS/cm or μS/cm. 1 mS/cm = 1000 μS/cm. TDS conversion: EC × 500 (0.5 scale) or × 700 (0.7 scale). Target values: Seedlings 0.4-0.8, vegetative 1.2-1.6, flowering 1.6-2.2 mS/cm. Too high EC leads to lockout, too low to deficiency symptoms.
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