| Minimum of isolation-feet: | ||
| Fields of 2 acres or less | Fields of more than 2 acres | |
| Foundation & registered | 400 | 200 |
| Certified | 200 | 100 |
| Maximum ratio of heads or plants | |||
| Factor | Foundation | Registered | Certified |
| Other varieties & off type | 1/1000 | 1/500 | 1/250 |
| Other kinds | 1/2000 | 1/1000 | 1/500 |
| (Inseparable other species) | |||
| Prohibited noxious weeds | None found | None found | None found |