Field dissipation of acetochlor in two New Zealand soils at two application rates

Journal of Environmental Quality
Qingli MaDon E McNaughton

Abstract

The persistence of pesticides in soils has both economic and environmental significance and is often used as a key parameter in pesticide risk assessment. Persistence of acetochlor [2'-ethyl-6'-methyl-N-(ethoxymethyl)-2-chloroacetylanilide] in two New Zealand field soils was measured over two years and the data were used to identify models that adequately describe acetochlor persistence in the field. Acetochlor was sprayed onto six fallow plots (3 x 9 m each) at each site at the recommended rate (2.5 kg a.i. ha(-1)) and at twice that rate. Acetochlor concentrations were measured in soil cores. Simple first-order kinetics (Model 1) adequately described acetochlor persistence in Hamilton clay loam soil (Humic Hapludull, Illuvial Spadic) at the high application rate, but overestimated it at the low application rate. A quadratic model (Model 2), a first-order double-exponential model (Model 3), a first-order biphasic model (Model 4), or a two-compartment model (Model 5) better described acetochlor persistence at the low application rate. The time for 50% (DT50) and 90% (DT90) of initial acetochlor loss was approximately 9 and 56 d, and 18 and 63 d at low and high application rates, respectively. The more complex Models 2 through 5 ...Continue Reading

Citations

Jun 29, 2012·Environmental Monitoring and Assessment·Sarika PitamAman Kumar
Jul 20, 2012·Environmental Science and Pollution Research International·Zhen BaiXu-Dong Zhang
Apr 5, 2008·Bulletin of Environmental Contamination and Toxicology·Suman GuptaR K Gupta
Apr 24, 2008·Bulletin of Environmental Contamination and Toxicology·Suman GuptaR K Gupta
Aug 20, 2010·Pest Management Science·Gry S JannicheHans-Jørgen Albrechtsen
Feb 20, 2014·Pest Management Science·Bipeng YanDangping Gao
Sep 4, 2013·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Dalibor Broznić, Čedomila Milin
Dec 10, 2016·Environmental Science and Pollution Research International·Ehssan TorabiMasoud Ahmadzadeh
Jan 18, 2014·Journal of Agricultural and Food Chemistry·Zhiyong ZhangXianjin Liu

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