| Classification of Fallow Period | *Length of Fallow period (years) | Effect on crops | Estimated Yield | |
| No. of bushels planted | No. of bushels harvested | |||
| Very short | 1 - 2 | Very low yield | 1 | 1.5 |
| Short | 3 - 4 | Low yield | 1 | 2.0 |
| Medium | 5 - 10 | Moderate | 1 | 2.5 |
| Long | 11 - 15 | High yield | 1 | 6.0 |
| Very long | 15 - 20 | Very high yield | 1 | 12 - 14 |