Browsing by Author "DİNDAR, EFSUN"

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Effects of canned food industry sludge amendment on enzyme activities in soil with earthworms
(Gh Asachi Technical Univ Iasi, 2013-12-01) Dindar, Efsun; Şağban, Fatma Olcay Topaç; Alkan, Ufuk; Başkaya, Hüseyin Savaş; DİNDAR, EFSUN; Şağban, Fatma Olcay Topaç; ALKAN, UFUK; Başkaya, Hüseyin Savaş; Uludağ Üniversitesi/Mühendislik Mimarlık Fakültesi/Çevre Mühendisliği Bölümü.; AAH-1853-2021; AAH-1131-2021; EJF-7179-2022; EMO-7525-2022
Wastewater sludges are organic and nutrient-rich materials that could be used to improve soil tilth. However, the land application of sludge needs to be properly managed to avoid the detrimental effects on micro and macroorganisms in the soil. Earthworms are one of the most important soil macroorganisms. Addition of sludge to the soil environment may impact earthworm activity, and in turn, soil productivity and health. In this study, sludge from the canned food industry was added to soil microcosms containing earthworms at application rates of 20, 40 and 80 g kg(-1) dry sludge. Alkaline phosphatase, dehydrogenase, beta-glucosidase and urease activities were measured in the earthworm casts and the surrounding soil throughout a 90 day incubation period at 20 degrees C. Enzyme activities significantly depended on the type of sampled material (soil or cast), the sludge dose, and the incubation time. The addition of canned food industry sludge resulted in increased enzyme activities in the earthworm casts and the surrounding soils (reaching approximately 3-175% and 11-125%, respectively). The enzyme activities in the casts were higher than those in the surrounding soil until the 60th day of the experiment. However, all of the enzyme activities in the earthworm casts decreased after the 60th day due to nutrient depletion. The present study suggests that the accumulated earthworm casts produced from the digestion of canned food industry sludge may enhance the microbial activity and nutrients/organic matter content of surface and subsurface soils, potentially resulting in improved soil productivity.
Organomineral gübre kullanımının toprak azot proseslerine etkisi
(Bursa Uludağ Üniversitesi, 2023-08-09) Yiğit, Çiğdem Yazgan; DİNDAR, EFSUN; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Çevre Mühendisliği Bölümü; 0000-0002-4572-2512
Bu çalışmanın amacı, uygun koşullar altında katı organomineral gübre ile gübrelemenin toprağın azot prosesleri üzerindeki etkilerini belirlemektir. Organomineral gübre dozlarının azot süreçlerine etkisini değerlendirmek için, 100 g toprak örneği farklı miktarlarda (20 ve 40 g kg–1 ) organomineral gübre ile muamele edilmiştir. Örnekler daha sonra 15 ve 30 gün süreyle kontrollü koşullar altında karanlıkta 28° C'de inkübe edilmiştir. Alınan örneklerde NH4-N, NO3-N, arginin amonifikasyon oranı, nitrifikasyon potansiyeli belirlenmiştir. Sonuçlar, organomineral gübre uygulamasının toprak verimliliği üzerindeki etkisini belirlemede toprak azot proseslerinin biyoindikatör olarak kullanılabileceğini göstermiştir. 20 ve 40 g kg–1 organomineral gübre ile muamele edilmiş topraklarda amonyum azot seviyelerinin, sırasıyla %71 ve %73 oranında arttığı tespit edilmiştir. Ayrıca, amonifikasyon oranı, inkübasyon sonunda %61-80 oranında artmıştır. Topraklar nitrat içerikleri bakımından değerlendirildiğinde, her iki dozda yapılan organomineral gübre muamelesinin nitrat konsantrasyonlarını düşürerek nitrifikasyon potansiyelini baskıladığı tespit edilmiştir. Elde edilen veriler, organomineral gübre kullanımı ile bitkilerin azot kullanım verimliliğini artırabileceğini, böylece karasal ekosistemlerin üretkenliğini geliştirebileceği sonucuna varılmıştır. Sürdürülebilir bir tarım için organomineral gübre kullanımı ile aşırı gübre kullanımının neden olduğu çevre sorunlarını azaltabileceği ve toprak kalitesini artırarak tarım verimliliğini artırabileceğini göstermektedir.
Short-term impact of organomineral fertilizers and wastewater sludge on soil enzyme activities as soil quality indicators
(Parlar Scientific Publications (PSP), 2020-01-01) Dindar, Efsun; DİNDAR, EFSUN; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Çevre Mühendisliği Bölümü.; AAH-1131-2021
Soil enzymatic activities are widely used as bioindicators of soil quality. The objective of this study was to evaluate the effects of organomineral fertilizer (OMF) and wastewater sludge (WS) (with similar properties as OMF) applications on soil enzyme activities during an incubation period of 30 days.To evaluate the effect of OMF and WS concentrations on soil enzyme activities, 200 g soil portions were placed into plastic containers, and distilled water was added to different doses of OMF (50 and 100 t/ha) to bring the soil to 70% of its field capacity. The samples were then incubated under controlled conditions in the dark at 28 degrees C for 15 and 30 days.The results showed that the applications of OMF negatively affected enzyme activities in the short term. In particular, the OMF dose of 100 t/ha inhibited urease activity. The highest enzyme activities were recorded in the control soil for all treatments.Similarly, the WS applications also inhibited soil enzyme activities except for urease activity (UA).At the end of the incubation, the wastewater-sludge application doses of 50 and 100 t/ha increased urease activity by 42% and 40%, respectively. The reduction in alkaline phosphatase activity (APA) and dehydrogenase activity (DHA) for soils amended with 50 t/ha OMF and WS was determined to be 32-6% and 0-56%, respectively. Similarly, soil APA and DHA decreased by 38%-32% and 2.5%-39% in soil amended with doses of 100 t/ha of OMF and WS, respectively.The effects of wastewater sludge and OMF amendments on soil appear to depend on the origin of the contents and application dose. In terms of soil nitrogen and phosphorus cycles, wastewater sludge applications have been found to be more effective than OMF for soil fertility.