(a) Isolation. In order to prevent mechanical mixtures in planting, harvesting, running of drain furrows, levees, etc., fields for certification shall be separated from noncertified rice fields, and from certified rice fields of another variety, by the following distances:

1. (1) If the nearby field is drill seeded, the distance shall be fifteen feet (15’);
2. (2) If ground broadcast seeded, the distance shall be fifty feet (50’); and
3. (3) If aerial seeded, the distance shall be one hundred feet (100’).

(b) Field inspection standards.

1. (1) Other varieties shall not include variations which are characteristic of the variety.

2. (2) Inspectors will, at the time the field inspection is made:

   1. (A) Report the amount of other noxious weeds present;
   2. (B) Give the general condition of the field; and
   3. (C) Note the presence of any disease which might seriously affect the quality of the seed.