Metal ammonium phosphate alkylene urea buffered fertilizer
1998
Moore, W.P.
A method of preparing a new granular homogeneous metal ammonium phospate-alkylene urea buffered fertilizer containing slow releasing water insoluble nitrogen of two types which provide sustained nitrogen release. The method is based on the discovery that a strong metal ammonium phosphate matrix may be formed to homogeneously contain fine particles of alkylene urea compounds. The new buffered fertilizer provides concentrated slow release nitrogens, and phosphates and buffering amounts of metal nutrients. The alkylene urea may be formed in situ from liquids concommitantly with the formation of the metal ammonium phosphates, or it may be admixed as finey divided alkylene urea solids. The preferred alkylene urea are methylene ureas and polymers, isobutylene diurea, and crotonylidene diurea. The metal nutrients are divalent and are preferably magnesium, manganese, zinc, and iron reacted as oxides, hydroxides or carbonates. The ammonium ion is supplied in the method as anhydrous ammonia, ammonium hydroxide, and preferably as ammonium phosphate. The phosphate is supplied as phosphoric acids, ammonium phosphate, or preferably a combination of phospheric acid and ammonium phosphate. The method is mostly and effectively carried out in a high intensity mixer-reactor
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