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In this study, biogas production efficiencies of mixtures obtained by adding corn silage (CS) to citrus industrial wastes at different ratios were determined. Orange (OJPW) and tangerine processing juice wastes (TJPW) (crusts and shells) were selected as materials in the study. 25%, 50%, 75% of CS was added to these selected wastes. Changes in the obtained mixture chemical properties (dry matter, dry organic matter, crude ash, crude protein, crude oil, Acid Detergent Fiber (ADF), Neutral Detergent Fiber (NDF)), biogas production and methane content in the biogas were investigated. The results of the study showed that the highest crude protein content was found in 100% TJPW (10%), raw fat percentage in 100% TJPW (5.14%), dry matter content in 100% CS (93.56%), ADF in 100% CS (22.74%) and the NDF in a mixture of 25% OJPW + 75% CS (45.08%). The highest methane production was determined for a mixture of 100% TJPW and 50% TJPW + 50% OJPW (0.46 m 3 kg -1 ODM). Also the highest biogas production was determined in a mixture of 50% OJPW + 50% TJPW (0.90 m 3 kg -1 ODM). The mixing of CS in TJPW and OJPW reduced significantly the production of methane and biogas in the mixture. As a result of the statistical analysis, significant differences (P?0.05) were found in both methane and biogas production of agricultural wastes. © Ankara Üniversitesi Ziraat Fakültesi. Çukurova Üniversitesi: FBA-2017-7962 The analysis and experimental results of the materials discussed in this study were taken from the project supported by Çukurova University, Scientific Research Projects Management Unit (Project No: FBA-2017-7962). We thank them for their support.

Nowadays, biogas technology applications are gradually increasing worldwide due to the economic and environmental benefits. Many researches and studies related to the determination of the biogas potential of waste organic materials have been carried out in the recent years. Studies to determine the specific methane potential of organic waste materials have a great importance for both design and economical operation of the biogas plants.Energy potential that will be recovered from organic wastes are substantial in our country.Thanks to biogas plants gathering vegetable-fruit wastes and other organic wastes are planned to produce significant amount of renewable energy in our country markets. Owing to the use of organic wastes, the disposal of waste as well as energy production, soil, water, air pollution in terms of environmental protection are also minimized. On the other hand, the organic wastes produced from plants can also be utilised as fertilizer in vegetable production. In this study, the cumulative biogas and methane productions of tomato wastes were experimentally determined with HBT (Hohenheim Batch Testing) method. Biogas and methane yields of tomato wastes were found as 0.687-0.695 Nm3/kg OKM and 0.364-0.374 Nm3/kg OKM respectively. Obtained results for biogas production has importance.