Mobility and degradation of the herbicide imazosulfuron in lysimeters under field conditions |
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| Authors: | Mikata Kazuki Schnöder Frank Braunwarth Carola Ohta Kazunari Tashiro Shigeki |
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| Institution: | Agricultural Research Laboratories, Agro Company, Takeda Chemical Industries, Ltd., 10 Wadai, Tsukuba, Ibaraki 300-4247, Japan. Mikata_Kazuki@sumi-take.co.jp |
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| Abstract: | The mobility and degradation of imazosulfuron, labeled with carbon-14 at the imidazole (imi-(14)C]imazo) or pyrimidine ring (pyr-(14)C]imazo), in lysimeters with 1 m(2) surface and 110 cm depth were investigated for three years. One lysimeter was treated with imi-(14)C]imazo in two successive years at the rate of 50 g of active ingredient (ai)/ha each. The other two lysimeters were treated once with pyr-(14)C]imazo and a mixture (1:1, w/w) of the two labeled imazosulfurons, respectively (50 g of ai/ha). In the first and second years of monitoring, the yearly mean concentration of (14)C in the leachate water was <0.10 microg/L in each lysimeter. Although in the third year the concentration of (14)C in the leachate water was 0.17 microg/L for the lysimeter treated twice with imi-(14)C]imazo, the concentration of imazosulfuron and its degradation products in the leachate water ranged from 0.01 to 0.06 microg/L. At the study termination, the main portion of (14)C recovered was found in the upper 30 cm soil layer in each lysimeter, and no (14)C was detected below a depth of 50 cm. These findings indicated that imazosulfuron and its degradation products in soils translocated into groundwater only slightly. |
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