 This type of amendment creates acidic conditions (pH less than 7) in the litter, resulting in more of the ammoniacal nitrogen being temporarily retained as ammonium rather than ammonia.Ammonium is a highly reactive ion that bonds with sulfates, nitrates and phosphates to form ammonium salts that improve the nutrient value of litter when land applied as fertilizer.The acidity also creates unfavorable environment for urolytic bacteria reducing the production of enzymes that contribute to ammonia formation, resulting in reduced ammonia production.