Find out on a laptop, not on a crop.
Carbonate equilibrium solved by charge balance, so hard water resists an acid dose and then falls off a cliff exactly as it does in a tank. Plant uptake that changes with vapour pressure deficit. Carbon dioxide leaving an aerated reservoir, which is why pH climbs back after you corrected it. Every one of those breaks a controller written without it.
The comfortable middle. Enough buffer to forgive a small mistake, little enough that a day of dosing does not exhaust it.
This configuration held the crop
- Acid used
- 92 mL
- Nutrient used
- 39 mL
- Water topped up
- 216 L
- Discharged
- 0 L
- Simulated
- 168 h in 111 ms
| Stage | pH in band | pH seen | EC in band | EC seen | Water max | DO min | Dryback | Runoff − feed | Shots |
|---|---|---|---|---|---|---|---|---|---|
| Soak and sprout | 97% | 6.25 – 7.21 | 100% | 0.53 – 0.58 | 24.0 °C | 8.0 | 0% | +0.01 | 0 |
| Greening | 99% | 6.24 – 6.85 | 100% | 0.50 – 0.65 | 23.1 °C | 8.7 | 0% | -0.01 | 15 |
What it said while it ran
- warn No confirmed circulation flow — dosing held. · first at hour 0.0, 1 times
- warn Reservoir at 24.0 °C. Above 24 °C root disease pressure rises sharply and dissolved oxygen falls at the same time. · first at hour 5.0, 9 times
Every band on this site is a literature-derived starting point. None of them has been measured on your water, your cultivar or your polyhouse, and the variable that decides most of it — the alkalinity of what comes out of your borewell — is one this page cannot know. Validate on a small block before you commit a season.