(1) Land requirements for production of grass seed are as follows:

(a) A grass field planted with breeder seed for the production of foundation seed must not have been seeded to the same species, subspecies, variety, or strain of grass during the preceding five years of planting. The field must be planted in spaced rows. The five-year eligibility may be waived to three years with the use of fumigants and other short-term soil sterilization chemicals with prior approval of the certifying agency.

(b) A grass field planted with foundation seed for the production of registered seed must not have been seeded to the same species, subspecies, variety, or strain of grass during the preceding three years.

(c) A grass field planted with foundation, registered, or certified seed for the production of certified seed must not have been seeded to the same species, subspecies, variety or strain of grass during the preceding year from planting unless the previous planting was of the same variety and eligible to produce foundation, registered or certified seed.

(d) Reseeding of a grass field because of failure or partial failure of the first seeding may be done by referring to the guidelines in WAC 16-302-045(5).

(e) Grasses of the same kind growing in fencerows and other areas adjacent to the field must be controlled to prevent blooming.

(f) Prohibited noxious weeds in the field, or on ditchbanks, roadways, etc., adjacent to a certified field shall be controlled to prevent seed formation.