To initiate the decomposition process need decomposer inoculants and an easily available nutrient as C sources (sugar, carbohydrate) and N sources (protein, N inorganic fertilizer). Fresh organic materials are suitable sources for all nutrient needed. Cattle manure or Urea is important N sources for the initiation of composting process. Charcoal – Ash is referring the entire remnants of a wood/bamboo burning fire. In reality, what remains after a typical fire in a bamboo or wood burning stove or fireplace is both ash and charcoal. Both ash and charcoal can offer tremendous benefits to the compost and garden soil. In order to enhance the decomposition processes and its quality of compost, addition of other valuable materials are necessary. Therefore preliminary study of synergy of biochar for composting was conducted. The field experiments were conducted in Terantang village, Sampit-Central Kalimantan and laboratory analysis were conducted in the laboratory of ecology and physiology of microorganisms, Reserach Center for Biology Cibinong. The parameters measured were the number of plant growth promoting rhizobacteria after composting and the C/N ratio of the compost. Those all parameters were compared with natural composting (control). The significant higher number of PGPR and better quality of final compost of treated biochar were observed. In this paper, more detail the effect of biochar on composting, its quality of compost and their effect on sorghum nursery will be discussed.

Keywords: biochar, compost, plant growth promoting rhizobacteria, sorghum

Fischer,D. and Glaser, B (2012). Synergisms between Compost and Biochar for Sustainable Soil Amelioration, Management of Organic Waste, Dr. Sunil Kumar (Ed.), ISBN: 978-953-307-925-7, InTech

Donnelly E, Robertson J, Robinson D (2006). Potential uses for bracken (Pteridium aquilinum( L.) Kuhn). Aspects of Applied Biology 79, 289-290

Glaser, B., Lehmann, J., and Zech, W. (2002). Ameliorating physical and chemical properties of highly weathered soils in the tropics with charcoal - a review. Biol. Fertil. Soils 35:219-230.

Johnson, L. F. and. Curl,E. A (1972). Method for research on ecology of soil borne pathogens. Burgress Soc., 4:97–102.

Kuzyakov, Y.; Subbotina, I.; Chen, H. Q.; Bogomolova, I. & Xu, X. L. (2009). Black carbon decomposition and incorporation into soil microbial biomass estimated by C-14 labeling. Soil Biology & Biochemistry 41, 210-219.

Loper, J. E. and Schroth, M. N (1986). Influence of bacterial sources of indole-2-acetic acid on root elongation of sugar beet. Phytopath 76:386-389.

Neklyudov, A. D.; Fedotov, G. N. & Ivankin, A. N. (2006): Aerobic Processing of Organic Waste into Composts. In: Applied Biochemistry & Microbiology 42 (4), pp. 341–353.

Pitman, R. and Weber, J (1998). Bracken as a Peat Alternative, in The Forestry Authority, Edinburgh, Forestry Practice, p. 1-6.

Smith J.L.; Collins, H.P.; Bailey V.L (2010). The effect of young biochar on soil respiration, Soil Biology and Biochemistry, Vol. 42, Issue 12, pp. 2345-2347

Steiner, C; Melear, N.; Harris, K. & Das, K.C (2011). Biochar as bulking agent for poultry litter composting, Carbon Management, June 2011, Vol. 2, No. 3, pp. 227-230

Thies J., Rillig M.C. (2009). Characteristics of biochar: Biological properties. In: Biochar for environmental management: Science and technology, Lehmann J & Joseph S. (Eds)., pp.85-105, Earthscan, London