(a) A crop of the same kind must not have been grown or planted on the land for five (5), three (3), and two (2) years prior to stand establishment for producing the foundation, registered, and certified seed classes respectively.
(b)
(1) The land must be free of volunteer plants of vetch during the year immediately prior to establishment.
(2) No manure or other contaminating material shall be applied the year previous to seeding or during the establishment and productive life of the stand.
(3) Requirement is waived if the previous crop was of the same variety and of a certified class equal or superior to that of the crop seeded.