Establishments primarily engaged in manufacturing nitrogenous fertilizer materials or mixed fertilizers from nitrogenous materials produced in the same establishment. Included are ammonia fertilizer compounds and anhydrous ammonia, nitric acid, ammonium nitrate, ammonium sulfate and nitrogen solutions, urea, and natural organic fertilizers (except compost) and mixtures. …
Examples: Ammonia liquor, Ammonium nitrate and sulfate, Anhydrous ammonia, Aqua ammonia, made in ammonia plants, Fertilizers,
