Dissipation and mobility of the herbicide mesotrione in the soil of corn crops
2000
Rouchaud, J. | Neus, O. (Universite catholique de Louvain, Louvain-la-Neuve (Belgium). Laboratory of Phytopharmacy) | Eelen, H. | Bulcke, R.
The triketone herbicide mesotrione has been applied pre-emergence at the rate of 150 g ai per ha on corn crops grown during the same period in regions different as to their soil types. In the 0-10 cm surface soil layer of the crops grown on loam, clay, sandy-loam, or sandy soils, the mesotrione half-lives were 50, 42, 40 and 34 days, respectively. The cumulative effects of the soil textures and the recent organic fertilizer treatments explain the differences as to the mesotrione soil persistences. During the first two months following the application, mesotrione mainly remained in the 0-2 and 2-4 cm surface soil layers of the crop grown on loam soil; thereafter, it moved down by uniform diffusion as far as the 10-15 cm soil layer, the mesotrione concentrations becoming progressively similar in each of the 2 cm thick soil layers. The mesotrione movement in the sandy loam soil was similar as the one in loam soil. In the crop made on sandy soil, the uniform diffusion occurred already two months after the treatment. About the same was observed in clay soil. During the crops and after the corn harvest, no significant residue of mesotrione was detected in the 15-20 cm soil layer. After the corn harvest, the very low mesotrione residues remaining in the 0-15 cm soil layer should rapidly disappear at the high rate of herbicide soil biodegradation during the humid autumn season, and by the dilution due to the tilling which precedes the sowing of the following crop.
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