(a) A field inspection will be made at the time that offtypes and varietal admixtures can most readily be detected.

(b) Each grower shall file with the manager's office of the certifying agency a farm map showing separate fields, properly identified, together with a record of each field showing the date of planting, seed used, and other pertinent information. In the case of a field being entered in the certification program for the first time, a complete history for five years previous to birdsfoot trefoil planting shall be given. Each grower must keep a duplicate up-to-date farm map showing separate seed fields as a guide to proper identification for certification purposes and chronological history of the fields. The grower's copy shall be made available to the inspector.