Pengaruh Kadar Air Terhadap Proses Pengomposan Jerami Dicampur Kotoran Sapi

High yielding rice varieties can be produced the rice straw in one harvest reached 25 tons/ha can be used as raw material for compost fertilizer. The purpose of this study was to determine the influence of water content in the composting process of rice straw and cow dung, and to know the appropriate water content for the process of composting the form rice waste and cow dung more quickly. This study used 5 treatments: P1 (with water content of 40%), P2 (with water content of 45%), P3 (with water content of 50%), P4 (with water content of 55%), and P5 (with water content of 60%). The material weight for each treatment was 35 kg using comparison of rice straw and cow dung 3:4. The parameters observed were temperature, water content, yield, pH, nitrogen, carbon and C/N ratio. The maximum peak temperature of the 5 treatments is at 60% water content with temperature of 49.8oC and the lowest peak temperature is a 40% water content with a highest temperature of 48.4 oC. Early composting, pH values ranged from 6,4-6,6 and at the end of the composting process, pH values ranged from 6,9-7,2. The C/N ratio of all treatments meets the SNI standard ie the C/N ratio ranged from 18,60-19,01. The quality of compost that been produced from the raw materials of straw and cow dung on the five treatments was in accordance with the SNI standard no. 19-70302004 is used as a reference of compost quality.