Yosafat Bramantyasena Widyantaka, Sari Edi Cahyaningrum
Urea fertilizer has a high solubility that allows nitrogen in urea fertilizer to not be absorbed optimally, causing low usage efficiency. As a result, the application of urea fertilizer cannot be optimally utilized by plants and results in pollution. Increasing the efficiency of urea fertilizer can be done by making SRF fertilizer. In this study, SRF Bead fertilizer made from Chitosan-NaTPP-Urea was made. The purpose of this study was to determine the physical, chemical characteristics and kinetics of urea release from SRF Bead Chitosan-NaTPP-Urea fertilizer. This research used NaTPP variation with the ratio of 1:1; 2:1: 3:1 with chitosan. FTIR characterization of SRF Bead showed functional groups of O-H, N-H, C=O, C-H, P=O, and P-O-P. SRF Bead encapsulation efficiency has a range of 86-91%. SEM characterization has a round shape and has a porous surface. The swelling power has a range of 131-115%. SRF Bead has good stability at alkaline pH. The SRF Bead release test results were able to reduce the release of urea fertilizer with significant differences from variations using matrix with variation without the use of matrix. The 3:1 NaTPP addition variation is better as shown by the lowest cumulative release value of 61.59%. © 2025 Author(s).
Department of Chemistry, Faculty mathematics and Natural Science, Universitas Negeri Surabaya, Surabaya, 60231, Indonesia
