Role of soil sorption and microbial degradation on dissipation of mesotrione in plant-available soil water
| Autor: | Phil Westra, Wenlin Chen, Galen Brunk, Dale L. Shaner, Scott J. Nissen |
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| Rok vydání: | 2012 |
| Předmět: |
Environmental Engineering
Time Factors Bacteria Chemistry Cyclohexanones Water Sorption Soil science Soil carbon Management Monitoring Policy and Law Plants Pollution Waste Disposal Fluid Mesotrione Pore water pressure chemistry.chemical_compound Soil Desorption Environmental chemistry Soil water Microbial biodegradation Waste Management and Disposal Water content Water Pollutants Chemical Water Science and Technology |
| Zdroj: | Journal of environmental quality. 41(1) |
| ISSN: | 0047-2425 |
| Popis: | Mesotrione is a carotenoid biosynthesis-inhibiting herbicide labeled for pre-emergence and postemergence weed control in corn production. Understanding the factors that influence the dissipation of mesotrione in soil and in the plant-available water (PAW) is important for the environmental fate assessment and optimal weed management practices. The present research investigated the role of soil properties and microbial activities on the interrelated sorption and degradation processes of mesotrione in four soils by direct measurements of PAW. We found that mesotrione bound to the soils time dependently, with approximately 14 d to reach equilibrium. The 24-h batch-slurry equilibrium experiments provided the sorption partition coefficient ranging from 0.26 to 3.53 L kg(-1), depending on soil organic carbon and pH. The dissipation of mesotrione in the soil-bound phase was primarily attributed to desorption to the PAW. Degradation in the PAW was rapid and primarily dependent on microbial actions, with half-degradation time (DT(50)) |
| Databáze: | OpenAIRE |
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