Using agar and quaternized chitosan with good water solubility as starting materials,quaternized chitosan-agar hydrogel particles were prepared by non-covalent bonding and the sustained-release property of quaternized chitosan-agar hydrogel particles on urea was studied.The structure of the product was char-acterized by Fourier transform infrared spectroscopy,X-ray diffraction and scanning electron microscopy.The results showed that quaternized chitosan-agar hydrogel particles with porous structure have been syn-thesized and successfully loaded with urea.The prepared hydrogel particles had good swelling rate(397.53%)and the encapsulation rate of urea(51.83%).The cumulative release rate of urea was 81.37%after 72 h at room temperature,showing a good slow-release effect.Therefore,this study provides a scientific basis for further development of novel and efficient agricultural slow-release materials.
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