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.
| Stage | pH in band | pH seen | EC in band | EC seen | Water max | DO min | Dryback | Runoff − feed | Shots |
|---|---|---|---|---|---|---|---|---|---|
| Nursery | 96% | 5.63 – 7.21 | 99% | 0.66 – 0.95 | 22.6 °C | 8.0 | 0% | +0.01 | 1 |
| Grow-out | 97% | 5.77 – 6.49 | 98% | 0.74 – 1.46 | 22.3 °C | 8.8 | 0% | +0.01 | 1 |
| Finish | 97% | 5.77 – 6.48 | 98% | 0.95 – 1.33 | 21.3 °C | 8.9 | 0% | +0.01 | 1 |
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.
Answers from this site’s own tables. Not an AI.
Ask me anything about growing, and I will answer from what this site actually holds.
Right now, 104 crops can go in the ground for September. There are 24,425 guides behind me, and growing notes for 538 crops.
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Everything here is worked out from the crop tables, the guides and today’s date. If it cannot be worked out, it will say so.
Software, not a person. Nothing is recorded.