North Carolina General Statutes Chapter 106. Agriculture § 106-659. Minimum plant food content

Except as provided in this section, superphosphate containing less than eighteen percent (18%) available phosphate, or any mixed fertilizer in which the guarantees for the nitrogen, available phosphate, or soluble potash are in fractional percentages shall not be offered for sale, sold, or distributed in this State. Packages of 32 fluid ounces or less when in liquid form, or 32 ounces or less avoirdupois when in a dry form, may be sold in fractional percentages, but these packages are not exempt from any other requirements of this Article.