Full TGIF Record # 115066
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DOI:10.1081
Web URL(s):http://www.tandfonline.com/doi/full/10.1081/PFC-120025553
    Last checked: 11/16/2015
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    Notes: Guide page
http://www.tandfonline.com/doi/pdf/10.1081/PFC-120025553
    Last checked: 11/16/2015
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Publication Type:
i
Report
Author(s):Ahmad, Riaz; James, Trevor K.; Rahman, Anis; Holland, Patrick T.
Author Affiliation:Ahmad, James, and Rahman: AgResearch, Ruakura Research Centre, Hamilton, New Zealand; Holland: Cawthron Institute, Nelson, New Zealand
Title:Dissipation of the herbicide clopyralid in an allophanic soil: Laboratory and field studies
Source:Journal of Environmental Science and Health: Part B: Pesticides, Food Contaminants, and Agricultural Wastes. November 2003, p. 683-695.
# of Pages:13
Publishing Information:New York: Marcel Dekker
Keywords:TIC Keywords: Clopyralid; Half-life; Herbicide residues; Gas chromatography; Pasture soils; Heat dissipation; Herbicide application; Soil sterilization; Allophanic soils; Temperatures; Soil water content; Shade
Abstract/Contents:"Soil dissipation of the herbicide clopyralid (3,6-dichloropicolinic acid) was measured in laboratory incubations and in field plots under different management regimes. In laboratory studies, soil was spiked with commercial grade liquid formulation of clopyralid (Versatill®, 300 g a.i. L-1 soluble concentrate) @ 0.8 μg a.i. g-1 dry soil and the soil water content was maintained at 60% of water holding capacity of the soil. Treatments included incubation at 10°C, 20°C, 30°C, day/night cycles (25/15°C) and sterilized soil (20°C). Furthermore, a field study was conducted at the Waikato Research Orchard near Hamilton, New Zealand starting in November 2000 to measure dissipation rates of clopyralid under differing agricultural situations. The management regimes were: permanent pasture, permanent pasture shielded from direct sunlight, bare ground, and bare ground shielded from direct sunlight. Clopyralid was sprayed in dilute solution @ 600 g a.i. ha-1 on to field plots. Herbicide residue concentrations in soil samples taken at regular intervals after application were determined by gas chromatograph with electron capture detector. The laboratory experiments showed that dissipation rate of clopyralid was markedly faster in non-sterilized soil (20°C), with a half-life (t1/2) of 7.3 d, than in sterilized soil (20°C) with t1/2 of 57.8 d, demonstrating the importance of micro-organisms in the breakdown process. Higher temperatures lead to more rapid dissipation of clopyralid (t1/2, 4.1 d at 30°C vs 46.2 d at 10°C). Dissipation was also faster in the day/night (25/15°C) treatment (t1/2, 5.4 d), which could be partly due to activation of soil microbes by temperature fluctuations. In the field experiment, decomposition of clopyralid was much slower in the shaded plots under pasture (t1/2, 71.5 d) and bare ground (t1/2, 23.9 d) than in the unshaded pasture (t1/2, 5.0 d) and bare ground plots (t1/2, 12.9 d). These studies suggest that environmental factors such as temperature, soil water content, shading, and different management practices would have considerable influence on rate of clopyralid dissipation."
Language:English
References:29
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Ahman, R., T. K. James, A. Rahman, and P. T. Holland. 2003. Dissipation of the herbicide clopyralid in an allophanic soil: Laboratory and field studies. J. Environ. Sci. Health. p. 683-695.
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DOI: 10.1081
Web URL(s):
http://www.tandfonline.com/doi/full/10.1081/PFC-120025553
    Last checked: 11/16/2015
    Access conditions: Item is within a limited-access website
    Notes: Guide page
http://www.tandfonline.com/doi/pdf/10.1081/PFC-120025553
    Last checked: 11/16/2015
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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