PENGGUNAAN KITOSAN-POLIVINIL ALKOHOL (PVA)-KALSIUM KARBONAT SEBAGAI MATRIKS UREA SLOW-RELEASE FERTILIZER (SRF)
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Slow-release fertilizer merupakan metode efektif untuk meningkatkan efisiensi penyerapan pupuk, khususnya urea yang diperlukan tanaman pada fase awal pertumbuhan. Penelitian ini bertujuan mensintesis membran slow-release fertilizer (SRF) termodifikasi kitosan-Polivinil Alkohol (PVA) dengan variasi konsentrasi CaCO3 sebesar 0,01%, 0,05%, dan 0,1% (b/v). Karakterisasi uji swelling dan porositas, serta uji release urea selama 40 hari. Hasil menunjukkan bahwa peningkatan CaCO3 mempengaruhi struktur membran dan laju release urea. Membran C1 (0,01% CaCO3) memiliki porositas (74,52%) dan swelling (37,84%) tertinggi, menghasilkan release urea tercepat. Membran C2 (0,05% CaCO3) memberikan release tinggi dengan nilai porositas (21,33%) dan swelling (20.25%) lebih rendah, sehingga lebih stabil. Membran C3 (0,1% CaCO3) menunjukkan release urea paling rendah akibat agglomerasi CaCO3. Dengan demikian, konsentrasi CaCO3 sebesar 0,05% dinilai optimal untuk menghasilkan release urea yang tinggi namun terkendali dalam aplikasi pupuk berbasis membran kitosan–PVA.
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Referensi
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