A guaranteed-analysis label reports P and K as oxides (P₂O₅, K₂O). Every ppm calculation needs the elemental fraction. Enter the label numbers to decode them — do this first, before any dosing math.
What the ppm engine actually uses
| Nitrogen (N) | 4.00% |
| Phosphorus (P) | 7.86% |
| Potassium (K) | 31.54% |
| Calcium (Ca) | 0.00% |
| Magnesium (Mg) | 0.00% |
| Sulfur (S) | 0.00% |
Concentration if you dissolve this product [II-3.1]
Store %element for the actual product form you buy (the hydrated salt), not the anhydrous salt. Epsom salt is MgSO₄·7H₂O at 9.9% Mg — the anhydrous figure (20.2%) would halve your weigh-out. When the label and a table disagree, trust the label.
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