Test Estimated pH range of greatest availability of elements: – 6.0 – 8.0: Nitrogen – 6.5 – 8.0: Phosphorous – 6.0 – 10.0: Potassium, Sulfur – 6.5 – 9.0: Calcium, Magnesium – 6.5 – 10.0: Molybdenum (Don't ask me, I can't even say it) – 5.0 – 7.0: Manganese, Boron, Copper, Zinc – Below 6.5: Iron
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