(a) Breeder seed for the production of foundation seed shall be planted on land on which no crownvetch was grown or planted previously. During the year immediately prior to seeding, the land shall have been in a cultivated crop or fallow and the land shall be free from volunteer plants as determined by field inspection during the season in which the seeding is established. No manure or other contaminating amendments shall be applied during established and productive life of the stand.

(b) Foundation seed for the production of registered seed shall be planted on land on which no crownvetch was grown or planted previously. During the year immediately prior to seeding, the land shall have been in a cultivated crop or fallow and the land shall be free from volunteer plants as determined by field inspection during the season in which the seeding is established. No manure or other contaminating amendments shall be applied during established and productive life of the stand.

(c) Registered seed for the production of certified seed shall be planted on land on which no other variety or strain of crownvetch has been grown or planted during the five years prior to the one in which the present stand was planted. During the year immediately prior to seeding, the land shall have been in a cultivated crop or fallow and the land must be free from volunteer plants as determined by field inspection during the season in which the seeding is established. No manure or other contaminating amendments shall be applied during established and productive life of the stand.