2 Va. Admin. Code § 10-10-140
B. Land requirements.
C. Field standards.
2. Isolation. All fields used for the production of foundation, registered, or certified seed shall have the minimum isolation distance from fields of any other variety or fields of the same variety that do not meet the varietal purity requirements for certification, as given in the following table:
| Classes | Fields of less than 5 acres | Fields of 5 acres or more | |
| Registered | 880 yards | 220 yards | |
| Certified | 110 yards | 55 yards |
Unit of certification. The unit of certification shall be a field. Portions of a field not meeting requirements for certification shall not be allowed to reach the seed stage. Ten feet isolation is required between certified classes of the same variety.
4. Specific.
| Maximum Permitted-Ratio of Plants | |||
| Factor | Registered | Certified | |
| Other Types | 1:500 (0.2%) | 1:200 (0.5%) |
D. Seed standards
| Standards for Each Class | |||
| Factor | Registered | Certified | |
| Pure Seed (minimum) | 99.0% | 99.0% | |
| Other Crops (maximum) | 0.05% | 0.1% | |
| Inert Matter (maximum) | 1.0% | 1.0% | |
| Weed Seed (maximum) | 0.15% | 0.25% | |
| Objectionable Weed Seed | None | None | |
| Total Germination and Hard Seeds | 85.0% | 85.0% |
§§ 3.2-4024 of the Code of Virginia.
Derived from VR172-01-01 § 9, eff. April 1980.