Crabgrass

Land Requirements

A field to be eligible for the production of Foundation or Registered planting stock must have been free of other strains of the same species for two consecutive years proceeding the year that it is to be planted.

A field to be eligible for the production of Certified planting stock must have been free of other strains of the same species for one year proceeding the year that it is to be planted unless the preceeding crop was grown from certified seed of the same variety.

A field that has been kept very clean of crabgrass for two years may also be used to produce Registered of Certified seed. (Based upon research that says the vast majority of crabgrass seed is gone after two years in the soil)

Field Inspection

A field inspection must be made each year after the crop is headed but prior to harvest.

Field Standards

General Requirements

Unit of Certification

The unit of certification shall be a field, but a portion of a field may be approved provided the discarded portion can be harvested separately and is eliminated from certification.

Isolation

A minimum boundary of 50 feet shall be the isolation for Crabgrass

Specific Requirements

Factor	Maximum permitted in each class: Foundation	Maximum permitted in each class: Registered	Maximum permitted in each class: Certified
Other varieties	None	1%	2%

Referee Sample

A representative sample of at least one-half pound as the seed is to be sold shall be submitted 0to the Association for laboratory analysis.

Seed Standards

General Seed Standards

Factor	Maximum permitted in each class: Foundation	Maximum permitted in each class: Registered	Maximum permitted in each class: Certified
Weed Seed (maximum)¹	0.10%	0.30%	0.50%
Prohibited weeds (maximum)²	None	None	None
Total other crop seed (maximum)	0.20%	1.00%	2.00%
Other varieties (maximum)	0.10%	1.00%	2.00%
Other kinds (maximum)	0.10%	0.10%	0.25%
(For forage use) (maximum)	0.10%	0.10%	0.50%

¹Certified grass seed shall contain not more than 0.1 percent cheat.
²See Section XLI P, also, Texas blueweed (Helianthus ciliaris), dock (Rumex spp.), oxeye daisy (Chrysanthemum leucanthemum), red or sheep sorrel Rumex acetosella), purple nightshade (Solanum elaeagnifolium), horsenettle (Solanum carolinense), and wild mustard (Brassica kaber).

Specific Seed Standards

Species	Type of Reproduction	Percent inert matter (maximum): * F R	Percent inert matter (maximum): C	Percent weed seed (maximum): F R	Percent weed seed (maximum): C	Percent pure seed (minimum): F R	Percent pure seed (minimum): C	Percent germination (minimum): F R C
Red River Crabgrass (Digitaria ciliaris)	S/C	15.0	15.0	0.50	1.50	85.0	85.0	50

* Class of seed F = Foundation, R=Registered, C=Certified