You can apply every nutrient perfectly and still see deficiency — if soil pH is locking them away. pH is the master switch.
Why pH controls everything
At high pH, iron, zinc, manganese and phosphorus become unavailable; at very low pH, other problems appear. Most crops feed best between pH 6.0 and 7.0. Knowing your pH tells you which nutrients need chelated forms or acidifying help.
pH Quick Guide
| Soil pH | Condition | Watch for |
|---|---|---|
| Below 6 | Acidic | Ca, Mg shortages |
| 6.0–7.0 | Ideal | Best availability |
| Above 7.5 | Alkaline | Fe, Zn, Mn, P lock-up |
👉 Pro tip: On alkaline soils, run an acidic phosphorus source through drip and use chelated micronutrients to beat lock-up.
Key Takeaways
- pH decides what’s available
- 6.0–7.0 is the sweet spot
- High pH locks Fe, Zn, Mn, P
- Chelates & acidifiers help
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Disclaimer: doses are general guidelines. Always adjust to crop, soil test, growth stage and local agronomist advice.