“Product grade” means the shorthand representation of the minimum guarantee of available nutrient content expressed in terms of total nitrogen, available phosphate, and soluble potash with each guarantee separated by a hyphen. For example, 19-19-19.

Source. #10464, eff 11-26-13, EXPIRED: 11-26-23 New. #13947, INTERIM, eff 4-30-24, EXPIRED: 10-27-24 New. #14128, eff 11-26-24, EXPIRES: 11-26-34