Treflan Crop Rotation Intervals
| Interval | Crop |
| 12 months after spring/14 months after fall | Sugar beets |
| Red beets | |
| Spinach | |
| 12 months after spring/14 months after fall with >20 in rain | Proso millet |
| Sorghum | |
| Oats | |
| Annual or perennial grass crops | |
| 5 months | Crops other than those specifically addressed above |