Leaching of three imidazolinone herbicides during sprinkler irrigation

Journal of Environmental Quality
Allan J CessnaJonathan Bailey

Abstract

Some imidazolinone herbicides have been shown to be mobile in soil, raising concern about their possible movement to ground water. Three imidazolinone herbicides (imazamethabenz-methyl, 497 g ha(-1); imazethapyr, 14.7 g ha(-1); and imazamox, 14.7 g ha(-1)) commonly used in crop production on the Canadian prairies were applied to a tile-drained field to assess their susceptibility to leach when subjected to sprinkler irrigation using a center pivot. Tile-drain flow began when the water table rose above tile-drain depth, and peak flow rates corresponded to the greatest depths of ground water above the tile drains. Interception of irrigation water by the tile drains in each quadrant of the field varied from ∼11 to 20% of the water applied. Under a worst-case scenario in which irrigation began the day after herbicide application and irrigation water was applied at 25 mm d(-1) for 12 d, there was evidence of preferential flow of all three herbicides and hydrolysis of imazamethabenz-methyl to imazamethabenz in the initial samples of tile-drain effluent. In subsequent samples, concentrations (analysis by LC-MS-MS) of the summation of imazamethabenz-methyl (25-24,000 ng L(-1)) plus its hydrolysis product imazamethabenz (63-26,500 ng L(...Continue Reading

References

Oct 2, 2001·Journal of Environmental Quality·A J CessnaW Nicholaichuk
Oct 9, 2002·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·M ElazzouziJ M Chovelon
Mar 30, 2006·Journal of Agricultural and Food Chemistry·Luis A AvilaJames M Chandler
Aug 19, 2007·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Ona SakalieneKurt A Spokas
Feb 5, 2008·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Mohammadkazem RamezaniChristopher Preston
Jan 6, 2010·Journal of Environmental Quality·Allan J CessnaJonathan Bailey

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Citations

Aug 13, 2013·Phytochemical Analysis : PCA·Antonia M Rojano-DelgadoMaría Dolores Luque de Castro
May 20, 2016·Environmental Science and Pollution Research International·Sabine-Karen LammogliaLaure Mamy

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