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Effect of Soil Moisture on Atrazine and Cyanazine Persistence and Injury to Subsequent Cereal Crops in Southern Alberta

Published online by Cambridge University Press:  12 June 2017

Jim R. Moyer  and
Robert E. Blackshaw
Jim R. Moyer
Affiliation:
Agric. Can. Res. Stn., Lethbridge, AB Canada T1J 4B1
Robert E. Blackshaw
Affiliation:
Agric. Can. Res. Stn., Lethbridge, AB Canada T1J 4B1
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Abstract

One year after application under irrigated conditions, atrazine at 1.2 kg/ha injured oat but there was no effect after two years. On dryland, wheat and barley were injured for up to two years after atrazine was applied at 1.5 kg/ha. Atrazine concentrations in the soil were related to accumulated rainfall in an exponential equation. The equation predicted that, under the most severe drought conditions ever recorded for southern Alberta, injury to cereal crops could occur for at least three years after atrazine application at 1.2 to 1.5 kg/ha. Cyanazine did not injure subsequent crops under either irrigated or dryland conditions.

Keywords

Atrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diaminecyanazine 2-[[4-chloro-6-(ethylamino)-1,3,5-triazin-2-yl]amino]-2-methylpropanenitrilebarley, Hordeum vulgare L.oat, Avena sativa L.wheat, Triticum aestivum L.ResiduedissipationdroughtZea mays L.
Type
Research
Information
Weed Technology , Volume 7 , Issue 4 , December 1993 , pp. 988 - 994
Copyright
Copyright © 1994 by the Weed Science Society of America 

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