Isoproturon mineralization in an agricultural soil

The impact of soil moisture content and temperature on isoproturon (3-(4-isopropylphenyl)-1,1-dimethyl-urea [IPU]) mineralization activity was assessed on an agricultural soil regularly exposed to this herbicide. Mineralization of ^sup 14^C-IPU was monitored on soil microcosms incubated at different...

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Bibliographic Details
Published in:Biology and fertility of soils 2011-05, Vol.47 (4), p.427-435
Main Authors: El Sebaï, Talaat, Devers-lamrani, Marion, Lagacherie, Bernard, Rouard, Nadine, Soulas, Guy, Martin-laurent, Fabrice
Format: Article
Language:English
Subjects:
Agricultural land
Agriculture
Chemical and Process Engineering
Drought
Engineering Sciences
Environmental Sciences
Fluctuations
Food engineering
Life Sciences
Microcosms
Mineralization
Mineralogy
Moisture content
Soil moisture
Soils
Urea
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Summary:The impact of soil moisture content and temperature on isoproturon (3-(4-isopropylphenyl)-1,1-dimethyl-urea [IPU]) mineralization activity was assessed on an agricultural soil regularly exposed to this herbicide. Mineralization of ^sup 14^C-IPU was monitored on soil microcosms incubated at different temperatures (10°C, 20°C, 28°C) and soil moisture contents (9%, 12%, 15, 18%, 21%, 24%). An increase in temperature and/or soil moisture significantly enhanced the maximum rate and percentage of IPU mineralization while it decreased the lag time before mineralization. The maximum rate and percentage of IPU mineralization respectively ranged from 0.18% day^sup -1^ and 9% for the lowest temperature and soil moisture content pair (10°C-9%) to 1.51% day^sup -1^ and 27.1% for the highest pair (28°C-24%). Statistics revealed a cross interaction of temperature and soil moisture content on the maximum rate of IPU mineralization. The optimum conditions for IPU mineralization, estimated from the double Gaussian model, were 25.8°C and 24% soil moisture content. The influence of fluctuations in soil moisture content on IPU-mineralization was investigated by subjecting the soil microcosms to drought stress. When IPU was added at the end of the drought stress, it had no statistical effect on IPU mineralization. However, when it was added before the drought stress, two mineralization phases were observed: (1) one corresponding to the drought stress for which mineralization was low and (2) another one observed after restoration of soil moisture content characterized by higher mineralization rate. It can be concluded that climatic fluctuations affect the activity of IPU mineralizing microbial community, and may lead to an increase in IPU persistence.[PUBLICATION ABSTRACT]
ISSN:0178-2762
1432-0789
DOI:10.1007/s00374-011-0549-1