Time effect on bentazone sorption and degradation in soil

被引:36
作者
Boivin, A [1 ]
Cherrier, R [1 ]
Perrin-Ganier, C [1 ]
Schiavon, M [1 ]
机构
[1] INRA, ENSAIA, INPL, Lab Sols & Environm,UMR 1120, F-54505 Vandoeuvre Les Nancy, France
关键词
bentazone; soil; time-effect; availability; water contamination;
D O I
10.1002/ps.889
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Previous sorption/desorption batch experiments have indicated that bentazone is weakly sorbed by soils. In addition, field experiments have shown that 4% of the bentazone sprayed can be leached to drainage water. In order to complete bentazone characterisation, we have assessed the effect of time on its behaviour in contrasting soils. In laboratory studies, bentazone was added to three topsoils (sandy, loamy and clay soils). Bentazone degradation, sorption/desorption kinetics and isotherm measurements were carried out at different times. At 160 days after treatment, bentazone mineralisation amounts varied from 2.1% (sandy soil) to 14% (clay soil). The extractable amounts became lower (from 97% after treatment to 12% after 160 days for the clay soil) and a greater number of desorption series was needed to obtain these products. Nevertheless, at the end of the experiments, a small amount of bentazone was still extracted by water. At the same time, bound residues of bentazone reached 65% in clay soil. Statistical analysis indicated effects of both residence time and soil type on bentazone behaviour. (C) 2004 Society of Chemical Industry.
引用
收藏
页码:809 / 814
页数:6
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