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Predicting isoproturon long-term mineralization from short-term experiment: Can this be a suitable approach?
Fang Wang1, Ulrike Dörfler2, Xin Jiang3
1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Research Unit Microbe-Plant Interactions, 85764 Neuherberg, Germany.
Short-term experiments inaccurately predict long-term isoproturon (IPU) mineralization in neutral pH soils. While IPU dissipation is predictable, non-extractable residue and microbial biomass formation are overestimated, impacting CO2 release predictions.
Area of Science:
- Environmental chemistry
- Soil science
- Microbiology
Background:
- Isoproturon (IPU) is a widely used pesticide with environmental implications.
- Understanding pesticide degradation in soil is crucial for environmental risk assessment.
- Short-term studies are often used to predict long-term environmental fate, but their accuracy needs validation.
Purpose of the Study:
- To evaluate the reliability of short-term experiments in predicting the long-term soil mineralization of isoproturon (IPU).
- To assess the influence of soil properties, such as pH, on the predictive power of short-term experiments.
- To investigate the formation and fate of IPU metabolites and non-extractable residues (NER) over time.
Main Methods:
- Incubation of four agricultural soils with (14)C-labeled IPU for 39 days (short-term) and 265 days (long-term).
- Measurement of IPU mineralization (14CO2 evolution) and dissipation.
- Monitoring of IPU metabolite formation/dissipation, NER formation, and (14)C-microbial biomass.
Main Results:
- Short-term experiments overestimated IPU mineralization in neutral pH soils but were adequate for low pH soils.
- IPU and metabolite dissipation were accurately predicted short-term.
- Formation of NER and (14)C-microbial biomass were significantly overestimated in short-term studies, particularly in neutral pH soils.
- NER and microbial biomass contributed to later CO2 formation, highlighting their importance in long-term fate.
Conclusions:
- Short-term experiments are inadequate for predicting long-term isoproturon mineralization in neutral pH soils.
- Soil pH significantly influences the accuracy of short-term predictions for pesticide mineralization.
- Accurate long-term environmental fate assessment requires considering the formation and subsequent release from NER and microbial biomass.
