Soil Test Interpretation
General soil test interpretations
For crop production on acidic, mineral soils
Extractant: Mehlich 3
| Nutrient | Interpretation (mg/kg or ppm) | ||
|---|---|---|---|
| Low | Medium | High | |
| P | ≤25 | 26 - 45 | >45 |
| K | ≤35 | 36 - 60 | >60 |
| Mg | ≤20 | 21 - 40 | >40 |
For crop production on the calcareous soils of Miami-Dade County
Extractant: Mehlich 3
| Nutrient | Interpretation (mg/kg or ppm) | ||
|---|---|---|---|
| Low | Medium | High | |
| P | ≤76 | 77 - 104 | >104 |
| K | ≤85 | 86 - 150 | >150 |
Proposed P interpretation scale for the AB-DTPA extractant for calcareous soil
| Nutrient | Interpretation (mg/kg or ppm) | ||
|---|---|---|---|
| Low | Medium | High | |
| P | 0 - 5 | 6 - 10 | >10 |
Phosphorus soil test interpretation for commercial potato production
A provisional P fertilizer management recommendation for commercial potato production (chipping and table) became effective October 25, 2022.
The P fertilizer application rate to potato may be determined independent of a preplant soil test for P. Therefore, P fertilizer may be applied up to the maximum UF/IFAS recommended rate for potato of 120 lbs/acre P2O5 regardless of the soil test P value.
This provisional recommendation remains in effect as scientists further evaluate application rates.
Phosphorus soil test interpretation for turfgrass lawns
Do not apply phosphorus (P) fertilizer to a turfgrass lawn unless the Mehlich 3-extractable P is less than or equal to 20 mg/kg.