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Chemical analysis of the biosolid materials used in this study compared with the expected range for heavy soil in Hawai’i.
| Component (unit) | Biosolid | Expected (heavy soil) | Biosolid designation |
|---|---|---|---|
| pH | 5.9 | 5.8–6.2 | Normal |
| Electrical conductivity (mmhos/cm) | 23 | < 3.0 | Very high |
| Phosphorus (ppm) | 25 | 25–35 | Normal |
| Potassium (ppm) | 1579 | 200–300 | Very high |
| Calcium (ppm) | 2158 | 1,500–2,000 | High |
| Magnesium (ppm) | 1417 | 300–400 | Very high |
| Sodium (ppm) | 1508 | 81–120 | Very high |
