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Enhancement of nitrogen release properties of urea–kaolinite fertilizer with chitosan binder


Roshanravan, Bita and Soltani, Shahram Mahmoud and Abdul Rashid, Suraya and Mahdavi, Fariba and Yusop, Mohd Khanif (2015) Enhancement of nitrogen release properties of urea–kaolinite fertilizer with chitosan binder. Chemical Speciation & Bioavailability, 27 (1). pp. 44-51. ISSN 0954-2299; ESSN: 2047-6523


The use of controlled release fertilizer (CRF) has become a new trend to minimize environmental pollution. In this study, urea–kaolinite containing 20 wt% urea after one hour dry grinding was mixed with different concentrations of chitosan as a binder to prepare nitrogen-based CRF. Fourier transform infrared spectroscopy confirmed the hydrogen bonding between urea and kaolinite. Covalent interaction between urea–kaolinite and chitosan make the granules stronger. The nitrogen release was measured in 5 days interval using a diacetylmonoxime calorimetric method at a wavelength of 527 nm. The results illustrated that by increasing the chitosan concentration from 3 to 7.5%, nitrogen release decreased from 41.23 to 25.25% after one day and from 77.31 to 59.27% after 30 days incubation in water. Compressive stress at break tests confirmed that granules with chitosan 6% had the highest resistance and were chosen for ammonia volatilization tests. Ammonia volatilization was carried out using the forced-draft technique for a period of 10 weeks. The results showed that the total amount of ammonia loss for conventional urea fertilizer and urea–kaolinite–chitosan granules was 68.63 and 56.75%, respectively. This controlled release product could be applied in agricultural crop production purpose due to its controlled solubility in the soil, high nutrient use efficiency and potential economic benefits.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Agriculture
Faculty of Engineering
Institute of Advanced Technology
Institute of Tropical Agriculture
DOI Number: https://doi.org/10.1080/09542299.2015.1023090
Publisher: Taylor & Francis
Keywords: Nitrogen fertilizer; Ammonia volatilization; Controlled release; Urea–kaolinite; Chitosan
Depositing User: Mohd Hafiz Che Mahasan
Date Deposited: 13 Sep 2017 10:23
Last Modified: 11 Oct 2019 08:00
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1080/09542299.2015.1023090
URI: http://psasir.upm.edu.my/id/eprint/55500
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