The following kinds of agricultural seeds may not contain more than four percent (4%) by weight of weed seed of which not more than one-half of one percent of 1%) may be restricted noxious weed seed as prescribed in section 81-2,147.03(1)(f). No mixture of any such seed may qualify for this exemption unless the total pure seed by weight of the seeds listed in this section is greater than 50% of the total pure seed by weight:
Bluestem, Big
Bluestem, Little
Bluestem, Sand
Bluestem, Yellow
Grama, Blue
Grama, Sideoats
Indiangrass
Sandreed, Prairie
25 Neb. Admin. Code, ch. 7, § 013