Liquid organic fertilizer is a solution from the fermentation of organic materials by involving microorganisms as a destructor of macromolecular compounds into minerals that are easily absorbed by plants. The quality of organic fertilizers is the main ingredient to get productive plants. The quality of organic fertilizer is determined by the concentration of macro nutrients such as nitrogen (N), potassium (K), and phosphorus. Getting high amounts of macronutrients fertilized organically is not easy. Macro-nutrients in organic waste with high concentrations are very difficult to obtain because each organic waste does not have all three macro-nutrients simultaneously. It takes a combination of organic waste to increase the concentration of macro nutrients in organic fertilizers. The combination of tofu whey with banana waste is one technique to obtain organic fertilizers that are high in phosphorus content. This study aims to obtain the effect and conditions of fermentation on the addition of mass of banana waste to produce optimum levels of phosphorus (P) in liquid fertilizer of tofu waste. The type of research used is pre-experimental research. The design of this study used a completely randomized design (CRD) with two factors, namely the first factor was the mass of banana waste (X) (X1 = 250 grams, X2 = 500 grams, X3 = 750 grams) and the second factor was the fermentation time (Y) (Y1 = 14 days, Y2 = 28 days, Y3 = 42 days). Determination of phosphorus content using UV-Vis spectroscopy instrument. Parameters measured were phosphorus (P) levels in liquid organic fertilizer. The independent variables in this study were the mass of banana waste and fermentation time, while the dependent variable in this study was the phosphorus content of the liquid fertilizer produced. The results of the analysis show that the phosphorus content (P) produced is X1Y1 = 0.1%, X2Y1 = 0.5%, X3Y1 = 0.09%, X1Y2 = 0.5%, X2Y2 = 2%, X3Y2 = 1.9 %, X1Y3 = 0.2%, X2Y3 = 0.5% and X3Y3 = 0.5%. There is an effect with the addition of a mass of banana waste as much as 250 grams at a 12-day fermentation time. It can be concluded that the liquid fertilizer produced has exceeded the SNI quality standard.
kegiatan pengabdian kepada masyarakat ini bertujuan untuk menambahkan kreativitas guru dalam melihat permasalahan lingkungan disekitar sekolah. Salah satu permasalahan yang dihadapi guru di SMAN 08 Mataram aroma tidak sedap dari limbah pengolahan tahu, limbah organik dari daun-daun pepohonan yang ada disekitar sekolah dan. Limbah cair yang terbuang secara langsung keparit sekitar sekolah menimbut aroma tidak enak. Aroma ini menyebabkan siswa terganggu dalam melakukan proses kegiatan belajar. Dibutuhkan teknologi untuk mengatasi masalah tersebut. Pengolahan limbah menjedi pupuk organik cair menjedi salah satu solusi untuk menjawab permasalahan tersebut. Pembuatan pupuk organik membutuhkan mikroorganisme untuk menguraikan bahan organik menjadi mineral yang lebih mudah diserap oleh tanaman. Metode kegiatan berupa pelatihan kemudian dilanjutkan dengan pembautan starter dari limbah buah dan bahan organik yang kaya dengan mineral yang ada dilingkungan sekitar sekolah. Berdasarkan hasil evaluasi guru dan siswa menunjukkan antusias yang besar terbukti semua siswa mengikuti kegiatan sampe selesai. Banyaknya pertanyaan dari guru dan siswa bagaimana aplikasinya lebih lanjutnya terhadap tanaman juga merupakan bukti ketertarikan guru dan siswa untuk mengaplikasikan pupuk yang akan dibuat. Guru dan siswa berharap kegitan ini bisa dilanjutkan proses pengabdian ini bisa diintegrasikan dalam pembelajaran IPA untuk mengsilkan proses pembelajaran yang lebih bermakna.
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