Preparation of Controlled Release Urea and its Release Characteristics

Abstract:

A series of novel coated urea, which do no harm to soil, were prepared by the method of melt atomizing coating. The coating is composed of paraffin wax, rosin and the CaHPO4 powder which used as additive. The release characteristics of the coated urea were determined by marinating in water and in soil respectively. Surface and cross-section morphology of the coated urea were studied by scanning electronic microscopy (SEM). The influences of coating content on the nitrogen release rate were discussed. The results indicate that the coating content plays a significant role in the nitrogen release. The results of release data regression show that the nitrogen release behavior of the coated urea could be characterized by the first-order release kinetics; the releasing period in water at 25 is 10.07 d for CRC-25, 17.88 d for CRC-30 when 80% nitrogen was released, respectively. And the releasing period in soil at 25 °C is over 130 d for the two coanted urea; the SEM for the coated urea show that the aperture in the membrane is less than 2 μm.

• Periodical: Advanced Materials Research (Volumes 652-654)
• Pages: 698-702
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.652-654.698
• Online since: January 2013
• Authors: Shi Xiong Hao, Xing Yong Liu, Zu Xiao Yu
• Keywords: Coated Urea, Controlled Release, Cross-Section Topography, Surface Topography

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