| Depths | SOC (transect means) | SOC (transect means) | SOC difference | Percentage |
| cm | Mg ha−1 layer−1 | Mg ha−1 layer−1 | Mg ha−1 layer−1 | change |
| Interfluve (prairie) | Interfluve (cropland) | |||
| 0 - 15 | 79.10a* | 53.15b | −25.92 | −32% |
| 15 - 30 | 48.64a | 47.43a | −1.21 | −2% |
| 30 - 50 | 27.72a | 35.50b | 7.78 | 28% |
| 0 - 50 | 155.46a | 136.09a | −19.37 | −12% |
| Shoulder (prairie) | Shoulder (cropland) | |||
| 0 - 15 | 78.28a | 44.61b | −33.67 | −43% |
| 15 - 30 | 58.86a | 33.99b | −24.87 | −54% |
| 30 - 50 | 46.62a | 43.59a | −3.03 | −6% |
| 0 - 50 | 183.77a | 122.19b | −68.58 | −57% |
| Backslope (prairie) | Backslope (cropland) | |||
| 0 - 15 | 74.30a | 51.09b | −23.21 | −61% |
| 15 - 30 | 51.34a | 48.68a | −2.66 | −5% |
| 30 - 50 | 40.85a | 47.57a | 6.72 | 16% |
| 0 - 50 | 166.49a | 147.34a | −19.15 | −11% |
| Footslope (prairie) | Footslope (cropland) | |||
| 0 - 15 | 65.21a | 62.49a | −2.72 | −4% |
| 15 - 30 | 56.82a | 49.10a | −7.72 | −13% |
| 30 - 50 | 45.78a | 39.76a | −6.02 | −13% |
| 0 - 50 | 167.80a | 151.3a | −16.45 | −13% |
| Toeslope (prairie) | Toesleope (cropland) | |||
| 0 - 15 | 86.41a | 41.06b | −45.35 | −52% |
| 15 - 30 | 43.92a | 34.17b | −9.75 | −22% |
| 30 - 50 | 42.56a | 35.15a | −7.41 | −17% |
| 0 - 50 | 172.89a | 110.38b | −62.51 | −36% |