title: Mapping field spatial distribution patterns of isoproturon-mineralizing activity over a three-year winter wheat/rape seed/barley rotation.
abstract: The temporal and spatial variability of the activity of soil microorganisms able to mineralize the herbicide isoproturon (IPU) pesticide was investigated over a three-year long crop rotation between 2008 and 2010. Isoproturon mineralization was higher in 2008, when winter wheat was treated with this herbicide, than in 2009 and 2010, when rape seed and barley were treated with different herbicides. Under laboratory conditions, we showed that isoproturon mineralization was not promoted by sulfonylurea herbicide applied on barley crop in 2010. IPU mineralization was shown to be highly variable at the field scale in years 2009 and 2010. Principal component analyses and analyses of similarities revealed that soil pH and equivalent humidity, and to a lesser extent soil organic matter content and cation exchange capacity (CEC) were the main drivers of isoproturon-mineralizing activity variance. Using a rather simple model that yields the rate of isoproturon mineralization as a function of soil pH and equivalent humidity, we explained up to 85% of the variance observed. Mapping field-scale distribution of isoproturon mineralization over the three-year survey indicated higher variability in 2009 and in 2010 as compared to 2008, suggesting that isoproturon treatment applied to winter wheat promoted isoproturon mineralization activity and reduced its spatial variability. Field-scale distribution of isoproturon mineralization showed important similarity to the distribution of soil pH, equivalent humidity and to a lesser extent to soil organic matter and cation exchange capacity (CEC) thereby confirming our model.
authors.affiliation: INRA, UMR 1347 Agroecologie, 17 rue Sully, BP 86510, 21065 Dijon Cedex, France.
authors.forename: S
authors.initials: S
authors.lastname: Hussain
authors.affiliation: INRA, UMR 1347 Agroecologie, 17 rue Sully, BP 86510, 21065 Dijon Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Devers-Lamrani
authors.affiliation: INRA, UMR 1347 Agroecologie, 17 rue Sully, BP 86510, 21065 Dijon Cedex, France.
authors.forename: A
authors.initials: A
authors.lastname: Spor
authors.affiliation: INRA, UMR 1347 Agroecologie, 17 rue Sully, BP 86510, 21065 Dijon Cedex, France.
authors.forename: N
authors.initials: N
authors.lastname: Rouard
authors.affiliation: INRA, UMR 1347 Agroecologie, 17 rue Sully, BP 86510, 21065 Dijon Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Porcherot
authors.affiliation: INRA, UMR 1347 Agroecologie, 17 rue Sully, BP 86510, 21065 Dijon Cedex, France.
authors.forename: J
authors.initials: J
authors.lastname: Beguet
authors.affiliation: INRA, UMR 1347 Agroecologie, 17 rue Sully, BP 86510, 21065 Dijon Cedex, France. Electronic address: fabrice.martin@dijon.inra.fr.
authors.forename: F
authors.initials: F
authors.lastname: Martin-Laurent
mesh_terms: D001419:Bacteria / Q000378:metabolism; D029741:Brassica rapa / Q000737:chemistry* / Q000378:metabolism; D002250:Carbon Radioisotopes / Q000737:chemistry; D006540:Herbicides / Q000032:analysis / Q000378:metabolism*; D001467:Hordeum / Q000737:chemistry* / Q000378:metabolism; D007700:Kinetics; D010671:Phenylurea Compounds / Q000032:analysis / Q000378:metabolism*; D025341:Principal Component Analysis; D011874:Radiometry; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis* / Q000378:metabolism; D013997:Time Factors; D014908:Triticum / Q000737:chemistry* / Q000378:metabolism
chemical_list: D002250:Carbon Radioisotopes; D006540:Herbicides; D010671:Phenylurea Compounds; D012989:Soil Pollutants; C028904:isoproturon