Soil Proficiency Test Schedule
| 2024 SM Soil PT Study Schedule | ||
| Study Number | Study Opens | Study Closes |
| SM-140 | Feb. 6, 2024 | March 21, 2024 |
| SM-141 | March 26, 2024 | May 9, 2024 |
| SM-142 | Aug. 20, 2024 | Oct. 3, 2024 |
| SM-143 | Oct. 21, 2024 | Dec. 4, 2024 |
Analyte
| Ammonia as N | 300-3000 mg/kg |
| Kjeldahl nitrogen (TKN) | 400-4000 mg/kg |
| Total Phosphorus | 300-3000 mg/kg |
| Total Organic Carbon (TOC) | 1000-15000 mg/kg |
