"Agricultural minerals" means substances, mixtures of mineral substances, and mixtures of mineral and organic substances, containing less than 5 percent in available form of nitrogen, phosphorus pentoxide, or potassium oxide, singly, collectively, or in combination, except sand and soil, unless otherwise authorized by the Director.
[Part 2:203:1951] — (NRS A 1993, 1791; 1999, 3733)