Abstract
As mentioned previously, ammonia is the source of more than 95% of the chemical nitrogen fertilizer currently produced in the world. Ammonia may be used directly as a fertilizer (see chapter X) or converted to ammonium salts, nitrates, or urea. No accurate estimates are available as to the percentage of these various products in world use. In Europe the leading form of nitrogen fertilizer is ammonium nitrate, either as such, in mixtures with calcium carbonate, or in compound fertilizers including nitrophosphates. In Asia urea is the leading form either as such or in compound fertilizers. In North America anhydrous ammonia is the leading form of nitrogen fertilizer. Individual countries within these and other continents may have other preferences.
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