<![CDATA[Composting liquid organic fertilizer, composting efficiency may be gauged using the variation in material volume with headspace. The purpose of this study is to ascertain how the ratio of materials to headspace affects the rate of composting and the quality of the POC that results, as well as to identify the ratio of materials to headspace that yields the best POC quality in accordance with the minimal technical POC requirements based here on Decision of the Minister of Agriculture of the Republic of Indonesia No. 261/KPTS/SR.310/M/4/2019. Composting uses an anaerobic system and the materials used are fruit and vegetable waste. The method used is a one-factor Completely Randomized Design.The factor used is the ratio of material and headspace, namely 1:5, 2:4, 3:3, 4:2, and 5:1. The five treatment were repeated 3 times to obtain 15 experimental units. The research parameters include the initial content of the material, total microbial bioactivator, temperature, pH, material height shrinkage, nitrogen, phosphorus, potassium, and C-organic content, C/N ratio, organic matter, EC, and total POC bacteria. Data obtained from observations were analyzed by ANOVA test and continued with Duncan's test. In general, the quality of the POC produced complies with the minimum technical requirements with POC temperature 29,3°C-29,8°C, POC pH 5,3-6,3, nitrogen content 2,01%-2,15%, phosphorus 2,02%-2,09%, potassium 2,03%-2,08%, C-organic 2,39%-3,69%, and total POC bacteria 5,31×107-3,12×109cfu/ml. The ratio of materials and headspace affect the rate of composting and the quality of the resulting POC. Treatment P2 (2:4) is the best treatment based on results of data analysis and parameters used.]]>
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