Table 2 Properties of NPK fertilizer and cow dung used
From: Factorial design study of total petroleum contaminated soil treatment using land farming technique
| Parameters | Cow dung | NPK fertilizer |
|---|---|---|
| pH | 8.27 | 9.62 |
| Organic carbon (%) | 14.36 | 8.06 |
| Total nitrogen (%) | 40.65 | 58.40 |
| Phosphate (mg kg−1) | 23.68 | 26.07 |
| Potassium (mg kg−1) | 17.49 | 7.83 |
| Magnesium (mg kg−1) | 5.88 | 11.35 |
| Calcium (mg kg−1) | 1.42 | 37.55 |
| Sodium (mg kg−1) | 1.94 | 1.06 |