TAILIEUCHUNG - Effect of some organophosphorus insecticides on soil microorganisms
The effect of some organophosphorus insecticides [Isofenphos (=Oftanol DS 40), Phorate (=Thimet 10G and Foratox 10-G) and Fonofos] were investigated on soil microbiota (total viable bacteria, actinomycetes, anaerobic bacteria, aerobic endospores, proteolytic bacteria, cellülolytic microorganisms and yeast-mold). | Turk J Biol 25 (2001) 51-58 © T†BÜTAK Effect of Some Organophosphorus Insecticides on Soil Microorganisms Metin DIÚRAK, FerdaÛ KAZANICI Kahramanmaraß SŸt•Ÿ Ümam University, Faculty of Arts & Science, Department of Microbiology, 46045, Kahramanmaraß - TURKEY Received: Abstract : The effect of some organophosphorus insecticides [Isofenphos (=Oftanol DS 40), Phorate (=Thimet 10G and Foratox 10-G) and Fonofos] were investigated on soil microbiota (total viable bacteria, actinomycetes, anaerobic bacteria, aerobic endospores, proteolytic bacteria, cellŸlolytic microorganisms and yeast-mold). In the isofenphos-treated soil sample, the total viable bacteria number was found to be higher than that of the control groups during incubation. Moreover, it was observed that this treatment had no inhibitory effect on the development of the other microorganism groups. It was determined that the fonofos and phorate pesticides were had no inhibitory effect on the development of the soil microorganism groups. Key Words: Organophosphorus insecticide, Soil microorganisms Introduction The wide use of organophosphorus pesticides has created numerous problems, including the pollution of the environment. Organophosphorus insecticides (., isofenphos, chlorpyrifos, diazinon, phorate, ethoprop, terbufos, phosalone, pirimiphos methyl) are registered for use against soil-dwelling pests of corn such as larval corn rootworms (Diabrotica spp.) and cutworms (Agrotis spp.). Organophosphorus pesticides are regarded as non-persistent (1). In recent years, the role of soil microorganisms in affecting the persistence of agricultural pesticides has been the subject of two areas of study. The first is the capacity for rapid elimination of highly persistent or toxic chemicals. The second is reduced pesticide efficacy attributed to enhanced biodegradation, particularly of chemicals applied under a continuous cropping program. In one study, a streptomycete bacterium was isolated from a field
đang nạp các trang xem trước
