Substrate blueberries do not forgive EC or pH drift. We have been dosing them in Yunnan's highland plantations since 2018, and that configuration is what we ship.
In substrate there is no soil buffer to absorb a mistake. Alkalinity decides how fast the root zone drifts, and it decides the acid dose. We ask for the water analysis before we recommend a model.
| Parameter | Why it matters |
|---|---|
| pH | Above roughly 7 the micronutrients start locking up, whatever the recipe says |
| Alkalinity (bicarbonate) | Sets the acid dose. It is the single number most growers do not measure |
| Source EC | Whatever the source brings leaves less headroom for nutrient salts in the root zone |
| Na / Cl | Toxicity risk that no amount of dosing accuracy can correct |
| Ca / Mg | Balance and scaling risk in the acid injection path |