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Title of Journal: Biol Fertil Soils

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Abbravation: Biology and Fertility of Soils

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Springer-Verlag

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DOI

10.1007/bf01322749

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1432-0789

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Isoproturon mineralization in an agricultural soil

Authors: Talaat El Sebaï Marion DeversLamrani Bernard Lagacherie Nadine Rouard Guy Soulas Fabrice MartinLaurent
Publish Date: 2011/02/22
Volume: 47, Issue: 4, Pages: 427-435
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Abstract

The impact of soil moisture content and temperature on isoproturon 34isopropylphenyl11dimethylurea IPU mineralization activity was assessed on an agricultural soil regularly exposed to this herbicide Mineralization of 14CIPU 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 018 day−1 and 9 for the lowest temperature and soil moisture content pair 10°C–9 to 151 day−1 and 271 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 258°C and 24 soil moisture content The influence of fluctuations in soil moisture content on IPUmineralization 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 persistenceWe greatly thank the Monks of the Abbey of Citeaux for offering access to a field site on their farmland from where the soil was sampled to perform this study We would like to thank the Egyptian Ministry of Research for funding PhD work of Talaat El Sebai We also thank Diana Warwick for editing the manuscript

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