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Tillage systems and atrazine and alachlor residues on a poorly drained soil

Tillage systems and atrazine and alachlor residues on a poorly drained soil

Canadian Journal of Soil Science 67(4): 959-964

Seasonal residues of an acetanilide and triazine herbicide were monitored in ridge, conventional, and zero tillage systems. Alachlor (2-chloro-2',6'-diethyl-N-(methoxymethyl)acetanilide), and atrazine (2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine) residues were less than 8% of the spring application concentration at the end of the growing season. Moldboard plowing in the fall reduced herbicide residues in spring because of soil dilution by plowing to greater than the sampling depth. Ridge tillage systems had higher spring residues apparently because of reduced herbicide dissipation on the drier ridge tops. The higher residues of the triazines on ridge tops may be injurious to triazine sensitive crops.

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Accession: 001719537

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DOI: 10.4141/cjss87-091

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