Dissipation and mobility of the sulfonylaminocarbonyl-triazolinone herbicide propoxycarbazone in the soil of winter wheat crops
2001
Rouchaud, J. | Neus, O. (Universite catholique de Louvain, Louvain-la-Neuve (Belgium). Lab. de Phytopharmacie) | Eelen, H. | Bulcke, R.
The new sulfonylaminocarbonyltriazolinone herbicide propoxycarbazone has been applied at the rate of 70 g per ha post-emergence in the spring on winter wheat fields located at three sites different as to their soil texture and composition. A method has been developed for the analysis of propoxycarbazone in soil by GC and GC-MS, after isolation and transformation of propoxycarbazone. The limit of sensitivity was 1 microgram propoxycarbazone per kg dry soil. In the sandy-loam soil at Melle, and in the clay-loam soil at Zevekote, the propoxycarbazone soil half-lives in the 0-10 cm surface soil layer were similar, i.e. about 54 days. In the loam soil at Cortil-Noirmont, the propoxycarbazone soil half-life was 31 days. The difference as to the soil half-lives was related to the organic fertilization practized in the past on the three fields. At Cortil-Noirmont, after the winter wheat harvest at the end of August, the residues of propoxycarbazone in the 0-10 cm surface soil layer were very low, and at the end of September, propoxycarbazone was no more detected. At Melle and Zevekote, at the end of September, the concentrations of propoxycarbazone in the 0-10 cm surface soil layer were very low; at the end of October, propoxycarbazone was no more detected. After its application and until the end of October, propoxycarbazone was not detected in the 10-15 and 15-20 cm surface soil layers.
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