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IntroductionDicyandiamide (DCD) is a nitrification inhibitor, itselfsusceptible to biodegradation (Ulpiani, 1906; Hauser andHaselwandter, 1990). Based on published data from incuba-tion of soil samples to which DCD had been applied, Kelliheret al. (2008) developed a relationship between time forDCD concentration to halve (t½) and the mean soil temper-ature (T), accounting for 85% of the variability. Under fieldconditions, additional factors might be influential.