Slow releasing urea and its producing method

The slow releasing urea is produced with polyvinyl acetate as coating polymer material and granular urea in the weight ratio of 1-3.1 to 100, preferably 2.041 to 100. The production process includes the steps of: sieving granular urea to obtain urea with grain size of 2-3 mm, dissolving polyvinyl ac...

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Bibliographische Detailangaben
1. Verfasser:	MIPING,WANG ZHOU
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY FERTILISERS FERTILISERS CHARACTERISED BY THEIR FORM MANUFACTURE THEREOF METALLURGY MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENTSUBCLASSES OF CLASS C05 MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVINGA SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES,SOIL-CONDITIONERS, WETTING AGENTS NITROGENOUS FERTILISERS
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Beschreibung
Zusammenfassung:	The slow releasing urea is produced with polyvinyl acetate as coating polymer material and granular urea in the weight ratio of 1-3.1 to 100, preferably 2.041 to 100. The production process includes the steps of: sieving granular urea to obtain urea with grain size of 2-3 mm, dissolving polyvinyl acetate in solvent to obtain coating solution, coating urea with the coating solution in the required weight ratio, stoving, sieving and packing. The present invention has proper thickness of coating to regulate nitrogen releasing rate and amount for synchronizing the growth period of crop. The present invention has the features of low cost, reduced pollution of nitrogen fertilizer on environment and agricultural product, etc.