| Maximum permitted: Ratio of Plant Field Producing* | |||
| Factor | Foundation | Registered | Certified |
| Other Variety | 1:1000 | 1:400 | 1:100 |
| Sweet Clover | 1:1000 | 1:400 | 1:100 |
| Other Inseparable Crops | 1:1000 | 1:400 | 1:100 |
| * | Prohibited noxious weeds must be controlled to prevent seed formation. |