A field study was undertaken during the growing seasons of 1988 and 1989 to investigate leaching characteristics of metolachlor, atrazine and two atrazine metabolites in two agricultural soils of Quebec, namely a sand and a loam field. In both years, atrazine was detected in higher levels in the groundwater of the loam field than of the sand field. Deethylatrazine was the only metabolite found in any significant quantity in soil in 1988 and in groundwater in 1989. Deisopropylatrazine was detected in groundwater at the beginning and at the end of the 1988 season and levels were similar in both fields. Metolach or was never detected in groundwater. / GLEAMS predictions favourably compared to field results at the 0-20 cm depth in both years. Half-life, however, had to be reduced by half in 1989 since higher temperature had increased dissipation. GLEAMS has not predicted leaching past 20 cm in either field in 1988 and 1989. During a dry summer, such as 1988 and 1989, leaching is mostly due to macropore flow and desorption of residues, two processes which are difficult to predict with existing models.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.60455 |
| Date | January 1990 |
| Creators | Masse, Lucie |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science (Department of Agricultural Engineering.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001221850, proquestno: AAIMM67622, Theses scanned by UMI/ProQuest. |
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