(a) Breeder seed for the production of foundation seed shall be planted on land on which no seed of the same species has grown or been planted during the previous five years. Land must be free from volunteer plants.

(b) Foundation or registered seed for the production of registered or certified seed respectively shall be planted on land on which no seed of the same species has grown or been planted during the previous year, except for foundation, registered, or certified seed of the same strain. The land shall be free from volunteer plants.