Why Water and Nutrients Matter
At a GACP cannabis farm, water chemistry and nutrient strength determine quality. Accordingly, Solar Farm measures runoff and controls supply pH and PPM (500 scale) so each lot meets medical-grade specifications for cannabis wholesale in Thailand.
Why Runoff Matters
Runoff reflects what roots actually experience, not just what the tank says. Reading pH and PPM from both feed and runoff shows uptake efficiency, salt accumulation, and media condition. This evidence lets a GACP cultivation team correct problems early and keep every lot within medical specifications for cannabis wholesale in Thailand.
Use a clean measuring jug, labeled catch trays, a pH meter, a PPM 500 scale meter, and alcohol wipes. Calibrate the pH meter daily with pH 7 and pH 4 solutions. Rinse probes with RO water before and after each reading. Stir samples for 10 to 15 seconds before recording values to stabilize readings.
Step-by-Step Protocol
- Select representative plants across the room: front, middle, back, and near doors or AC outlets.
- Record plant ID and pre-feed pot weight if you track weight.
- Feed on schedule. Note feed volume in milliliters and the time applied.
- Wait until dripping stops. Collect runoff in a clean container and measure the volume.
- Test feed pH and PPM, then test runoff pH and PPM.
- Compute runoff percent as (runoff ÷ feed) × 100.
- Log date, room, plant ID, operator, feed pH, feed PPM 500, runoff pH, runoff PPM 500, runoff percent, and notes.
Conclusion
Runoff testing, pH, and PPM measurement form the backbone of GACP cultivation. At Solar Farm, these checks guide irrigation and nutrition; together they help plants mature into safe, consistent medical cannabis ready for bulk supply.
Reading the runoff numbers day to day
A single runoff reading says very little. The value is in the direction it moves over several days, which is why Solar Farm Thailand records volume, pH and PPM at the same point in the cycle each day rather than whenever someone passes the bench. Two rooms with the same recipe can drift apart quickly, and the log is what makes that visible before the canopy shows it.
Rising runoff PPM with steady input usually means the plant is taking up less than it is being given, and the answer is normally volume and frequency rather than a stronger mix. Falling runoff PPM alongside rising volume points the other way. Drifting pH is read against the substrate rather than the tank, because coco behaves differently at the end of a cycle than at the start.
Dripper checks belong in the same round. A partially blocked emitter produces a plant that looks like a nutrient problem and is in fact a plumbing one, and it will not correct no matter what goes in the tank. Logging the dripper condition next to the runoff numbers is what separates the two, and it is the reason the daily sheet carries both.
Last updated: 17 August 2026