N.Y. Comp. Codes R. & Regs. tit. 1 § 113.4
A portion of a field may be certified if the area to be certified is clearly defined.
All fields used for the production of foundation, registered, or certified seed must be isolated from other strains of the same species or fields of the same variety not meeting varietal purity requirements for certification in accordance with the distances listed below:
Class | Fields of less than 5 acres | Fields of 5 acres or more |
| Foundation ....... | 80 rods | 80 rods |
| Registered ....... | 40 rods | 20 rods |
| Certified. ....... | 20 rods | 10 rods |
| Between different seed classes of the same variety ....... | 10 rods | 10 rods |
Certification of seed fields outside the region of adaptation of a variety shall be limited to stands not exceeding six years of age.
| Maximum permitted in each class | |||
Factor | Foundation | Registered | Certified |
| Other varieties1 ....... | 0.10% | 0.25% | 1.00% |
| Sweet clover ....... | none | none | 80 plants per acre |
| Noxious weeds whose seeds are inseparable 2 ....... | none | none | none |
Footnotes
1 Other varieties shall be considered to include offtype plants and plants that can be differentiated from the variety that is being inspected.
2 Noxious weeds whose seeds are inseparable are dodder (Cuscuta spp.), and bedstraw (Gallium aparine), (Gallium mollugo) and (Gallium verum.)
N.Y. Comp. Codes R. & Regs. Tit. 1 § 113.4