ETU mineralization in soil under influence of organic carbon content, temperature, concentration, and depth

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Abstract
The mineralization of 14C‐ETU was measured by the evolution of 14CO2 and described with a mathematical model consisting of two terms — one term describing the immediate mineralization of 14C‐ETU and another term describing the first order degradation of humus and/or biomass, where 14C had been built in. The influence of pesticide concentration, depth of soil, and incubation temperature showed combined interaction effects on the amount of 14CO2 formed during the process and on the degradation rate of the pesticide. With the addition of soil extract, a combined effect between concentration and addition of organic extract was seen for the degradation rate, while a three‐way interaction between depth, concentration and organic extract was seen for the formation of 14CO2. Degradation of 14C‐ETU can thus not be described only through investigations of one single of the mentioned parameters.