Kinetika Slow-Released Pupuk Urea Terenkapsulasi Dalam Alginat
DOI:
https://doi.org/10.35965/eco.v22i3.1830Keywords:
Alginat, Enkapsulasi, Slow-Release, UreaAbstract
Pupuk urea merupakan komoditas yang penting di sektor pertanian. Pupuk urea yang digunakan petani seringkali terbawa air sehingga pelepasannya tidak efisien. Oleh karena itu diperlukan proses enkapsulasi pupuk urea agar pelepasannya dapat dikontrol. Alginat dapat digunakan sebagai pelapis berbagai material. Tujuan penelitian adalh untuk mengetahui diameter rata-rata hasil enkapsulasi urea dengan alginate dan hasil uji pelepasan pupuk urea terenkapsulasi dalam alginat dalam air. Pada penelitian ini dilakukan pembuatan urea terenkapsulasi dalam alginat serta permodelan kinetika slow-release urea terenkapsulasi. Enkapsulasi urea dalam alginat menghasilkan butiran dengan diameter rata-rata 3,01 mm. Uji pelepasan urea dalam air masih terjadi setelah waktu 20 menit. Berdasarkan hasil permodelan diperoleh data nilai difusivitas efektif urea dalam butiran sebesar 5,2342 x 10-10 m2/s dan koefisien transfer massa urea dari permukaan butiran ke badan cairan sebesar 1,9684 x10-06 m/s.
Urea fertilizer is an important commodity in the agricultural sector. Urea used by farmers is often carried away by water so that its release is inefficient. Therefore, it is necessary to encapsulate urea so that its release can be controlled. Alginate can be used as a coating for various materials. In this study, the preparation of urea encapsulated in alginate and slow-release kinetics modeling was done. The encapsulated urea in alginate produced granules with an average diameter of 3.01 mm. The urea release test in water still occurred after 30 minutes. Based on the modeling, the effective diffusivity value of urea in granules was 5,2342 x 10-10 m2/s and the mass transfer coefficient of urea from the surface of the granules to the liquid was 1,9684 x 10-06 m/s.
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