¹Study Program of Soil Science Faculty of Agriculture, Sebelas Maret University, Indonesia
57126

²Study Program of Agrotechnology, Faculty of Agriculture, Sebelas Maret University,
Indonesia 57126

Email: vitaratri@staff.uns.ac.id

The composting process will take a long time if only rely on indigenous decomposing microorganisms. This study explored the source of the isolates as bioactivator of composting. The purpose of the present study was to isolate lignocellulolytic microorganisms from the peel of cassava, rice straw (RS), and sawdust and to investigate the effect of the lignocellulolytic microorganisms for the composting process of RS. The research was conducted by two steps. The first step was isolation of bacteria and fungi from the peel of cassava, RS, and sawdust by using media of CMC, Lignolitic and Omeliansky, and isolation general bacteria and Actinobacteria from the one week old RS compost by using media of NA and SCA. The second step was application of the mixture culture obtained from the first step as bioactivator for the composting of RS. As the control treatment, the other composting RS compost was also set up with no addition of bioactivator. After 70 days composting, the results showed that RS compost product from the composting using bioactivator indicated higher quality with C/N ratio, total N, available P and available K namely 15,2, 1,44%, 1,40%, and 1,86% comparing with control that were 23,2, 1,12%, 1,19%, and 1,63%, respectively.