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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 organic waste 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 is substantial in Turkey. Thanks to biogas plants gathering vegetable-fruit wastes and other organic wastes are planned to produce significant amount of renewable energy in Turkish markets. Owing to the use of organic wastes, the disposal of waste as well as energy production, soil, water and air pollution in terms of environmental protection are also minimized. On the other hand, the organic wastes produced from plants can also be utilized as fertilizer in vegetable production. In this study, the cumulative biogas and methane production of vegetable and fruit wastes were experimentally determined with HBT (Hohenheim Batch Test) method. Biogas and methane yields of vegetable and fruit wastes were found as 0.54-0.73 Nm 3 /(kg ODM) and 0.29-0.37 Nm 3 /(kg ODM), respectively. The highest value of the cumulative specific methane production was tomato wastes (0.37 Nm 3 /(kg ODM)), and the lowest value was lettuce wastes (0.29 Nm 3 /(kg ODM)), as well. The average cumulative specific methane production values of mixed vegetable and fruit wastes are determined as 0.34 Nm 3 /(kg ODM). depletion of fossil fuels, there has been a surge of attention towards renewable energy resources as the novel ways of energy procurement.Renewable energy resources are termed as alternative fossil energy resources and have been naturally extracted from the energy-flow already present in our natural habitat. The most salient renewable energy resources are listed respectively as the sun, wind, water, geothermal and biomass [1] .Among such renewable energy resources, particularly biomass technology draws much attention by virtue of the latest incentives. Biomass can be construed as the wood and other plants or any given animal wastes that can burn directly or can be converted to fuel [2] . In a different saying, biomass is a biogenic and non-fossil organic material mass. Its origin can be as diversified as agriculture and forest products, vegetable wastes, animal

Bu çalışmada, Türkiye İstatistik Kurumu (TUİK) verilerine göre Türkiye'nin ve on tarım bölgesinin; son 10 yıla (2010)(2011)(2012)(2013)(2014)(2015)(2016)(2017)(2018)(2019) ait tarımsal mekanizasyon düzeyi gösterge değerleri (kW ha -1 , traktör sayısı 1000 ha -1 , ha traktör -1 , makina traktör -1 ) belirlenmiş ve gelecek yıllar (2020-2030) için kW ha -1 değeri trend analizi yardımıyla tahmin edilmiş ve değerlendirilmiştir. Türkiye'nin on tarım bölgesi ve Türkiye genelinde yıllara göre mekanizasyon düzeyi göstergelerinden kW ha -1 ve traktör 1000 ha -1 değerleri artmış, makina traktör -1 değeri ise azalmıştır. kW ha -1 değeri; en yüksek Ege Bölgesinde (2.86-3.72 kW ha -1 ), en düşük Doğu Karadeniz Bölgesinde (0.35-0.44 kW ha -1 ) oluşmuş, Türkiye genelinde son on yılda ortalama %3.22 artış göstermiş ve 1.67-2.22 kW ha -1 olarak gerçekleşmiştir. Gelecek yıllar (2020-2030) için kW ha -1 değeri; Türkiye ve tüm tarım bölgelinde yıllara göre artış göstereceği tahmin edilmiştir. Gelecek yıllar (2020-2030) için ortalama artış değerleri %0.89-3.18 arasında gerçekleşeceği öngörülmektedir. kW ha -1 değeri; Türkiye geneli için 2020 yılında 2.27, 2025 yılında 2.55 ve 2030 yılında 2.84 olması tahmin edilmektedir. Makina traktör -1 oranındaki azalma; on yıllık süreçte makina sayılarındaki artış oranlarının traktör sayılarındaki artış oranlarından daha az olmasından kaynaklanmaktadır.

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.