The use of microbial activity to predict effects of herbicide clomazone on soil ecosystem

摘要: The aim of this study was to evaluate the microbial activity and rates ammonification nitrification processes in soils treated with herbicide clomazone during 60 days at laboratory conditions. experiment conducted using four differing their physicochemical properties, classified as sandy, silt loam, loamy sand silt. Pesticide applied five different doses, i.e. 0.2, 1.0, 5.0, 25.0 125.0 mg kg-1 soil. After 1, 15, 30, 45 nitrogen transformations were measured. To substrate-induced respiration method (SIR) used. Dehydrogenase (DHA) related microorganisms spectrophotometric 2,3,5-triphenyltetrazolium chloride (TTC) a substrate determined well. In addition, assessed by measurements NH4-N NO3-N concentrations. Considering results obtained, it that impact on variable depended dosage chemical. all lower pesticide doses SIR DHA stimulated. turn, higher significantly decreased both tested parameters. also influenced indicated changes concentrations experiment. Similarly soil intensity dehydrogenase increased processes, whereas same ammonification. However, reverse effect case found. observed effects strongly type, particularly organic matter clay contents. Taking into account obtained results, used dosage, corresponding maximum predicted 32 M. Cycon, Z. Piotrowska-Seget environmental did not show adverse activity. might have an resulting alteration equilibrium processes.