The aims of this study were to determine pH, population and to evaluate clear zone lactic acid bacteria isolated from waste cabbage with the addition of rice bran and different duration of fermentation. The design used was factorial completely randomized design 2×3, where factor A was the composition of the substrate, namely: A1 waste cabbage 100% + 0% rice bran, A2 was waste cabbage 65% + 35% rice bran. Factor B was the duration of fermentation: B1 for 0 day, B2 for 7 days, and B3 for 14 days. The parameters measured were pH, lactic acid bacteria population and clear zone of lactic acid bacteria. The results showed that the addition of rice bran and duration of fermentation provided high significant effect (P<0.01) in increasing of lactic acid bacteria population. The conclusion of the study was the addition of rice bran up to 35% with seven days fermentation were able to increase population of lactic acid bacteria and increase inhibition activities of lactic acid bacteria.Key Words: Waste Cabbage, Silage, Rice Bran ABSTRAKPenelitian ini bertujuan untuk mengetahui pH, populasi dan mengevaluasi zona bening bakteri asam laktat yang diisolasi dari limbah kol dengan penambahan dedak padi dan lama pemeraman yang berbeda. Penelitian menggunakan limbah kol dan dedak padi. Rancangan yang digunakan yaitu rancangan acak lengkap pola faktorial 2×3 yaitu faktor A adalah komposisi substrat yaitu: A1 limbah kol 100% + dedak padi 0%; A2 limbah kol 65% + dedak padi 35%. Faktor B adalah lama fermentasi yaitu: B1 0 hari, B2 7 hari dan B3 14 hari. Peubah yang diukur adalah pH, populasi bakteri asam laktat dan zona bening bakteri asam laktat. Hasil penelitian menunjukkan bahwa interaksi penambahan dedak padi dan lama fermentasi memberikan pengaruh sangat nyata (P<0,01) terhadap peningkatan populasi bakteri asam laktat. Kesimpulan dari penelitian ini adalah penambahan hingga 35% dengan lama fermentasi tujuh hari dapat meningkatan populasi bakteri asam laktat dan meningkatkan daya hambat bakteri asam laktat.Kata Kunci: Limbah Kol, Silase, Dedak PENDAHULUANPencemaran lingkungan karena sampah merupakan hasil yang ditimbulkan oleh aktivitas manusia yang menimbulkan perubahan langsung dan tidak langsung. Total sampah organik kota, sekitar 60% merupakan sayur-sayuran dan 40% merupakan daundaunan, kulit buah-buahan dan sisa makanan (Pramono 2004). Pencemaran yang dihasilkan sampah organik di pasar merupakan salah satu masalah yang dialami masyarakat sekitar, ini dikarenakan pasar sebagai tempat transaksi jual beli barang bagi masyarakat. Aktivitas
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