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Wang, F. ; Dörfler, U. ; Jiang, X.* ; Schroll, R.

Predicting isoproturon long-term mineralization from short-term experiment: Can this be a suitable approach?

Chemosphere 144, 312-318 (2016)

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A worldwide used pesticide - isoproturon (IPU) - was selected to test whether short-term experiments can be used to predict long-term mineralization of IPU in soil. IPU-mineralization was measured for 39 and 265 days in four different agricultural soils with a low mineralization dynamic. Additionally, in one soil IPU dissipation, formation and dissipation of metabolites, formation of non-extractable residues (NER) and ¹⁴C-microbial biomass from ¹⁴C-IPU were monitored for 39 and 265 days. The data from short-term and long-term experiments were used for model fitting. The long-term dynamics of IPU mineralization were considerably overestimated by the short-term experiments in two soils with neutral pH, while in two other soils with low pH and lower mineralization, the long-term mineralization of IPU could be sufficiently predicted. Additional investigations in one of the soils with neutral pH showed that dissipation of IPU and metabolites could be correctly predicted by the short-term experiment. However, the formation of NER and ¹⁴C-microbial biomass were remarkably overestimated by the short-term experiment. Further, it could be shown that the released NER and ¹⁴C-microbial biomass were the main contributors of ¹⁴CO₂ formation at later incubation stages. Taken together, our results indicate that in soils with neutral pH short-term experiments were inadequate to predict the long-term mineralization of IPU.

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