Sintesis dan Karakterisasi Urea Slow Release Fertilizer (SRF) dengan Matriks Kitosan Termodifikasi PVA/CaCO3
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Pupuk urea merupakan pupuk yang sering digunakan dalam sektor pertanian karena memiliki kelebihan yaitu memiliki kadar nitrogen yang tinggi (±46%). Namun, hanya 30-40% kadar nitrogen yang berhasil diserap oleh tanaman dimana sisanya terlepas ke lingkungan. Oleh karena itu, pembuatan SRF merupakan solusi yang dapat dilakukan untuk meningkatkan efisiensi penggunaan pupuk urea. Pada penelitian ini urea SRF telah berhasil disintesis melalui metode casting dimana pupuk urea dengan konsentrasi 0, 1000, 2000 dan 3000 ppm dilapisi dengan membran kitosan yang termodifikasi oleh PVA/CaCO3. Selain sintesis, membran urea SRF juga dikarakterisasi melalui uji swelling, uji porositas dan uji release urea. Hasil yang diperoleh untuk uji swelling dan porositas adalah semakin tinggi konsentrasi urea yang ditambahkan maka derajat swelling dan %porositas yang dihasilkan semakin menurun. Sedangkan hasil uji release urea menunjukkan semakin tinggi konsentrasi urea yang ada pada membran urea SRF, menyebabkan laju pelepasan urea meningkat sehingga %release urea yang dihasilkan semakin besar.
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Referensi
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