Measure and correct pH for cannabis: soil 6.0–7.0, hydro and coco 5.5–6.5 — use calibrated meters and adjust with pH-Up or pH-Down.
Optimum pH: Soil 6.0-7.0, Hydro 5.5-6.5, Coco 5.8-6.2. Measurement: Calibrated pH meters more precise than test strips. Calibration with 4.0 and 7.0 buffer solutions. Correction: Add pH-Up (potassium hydroxide) or pH-Down (phosphoric acid) drop by drop. Measure again after adding fertiliser - nutrients influence pH.
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