Dissipation of trifularin under conventional tillage in southwest Spain
(2002) EGS-General Assembly — Location: Nice
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- Abstract
- Mobility and persistence of trifluralin was studied in a silty-clay-loam (USDA) soil under conventional tillage (Moreno et al., 1997). Field experiments were carried out in a plot near Seville, Spain (37 7' N, 6 3' W, 30 m a.s.l.), cropped with sunflower 'Sanbro' from April 6 to July 15, 2001. On April 6, just before sowing, 1090 g/ha of trifluralin were applied. On the days 3, 10, 18, 24, 39, 52, 83 and 143 after the herbicide application, soil samples were collected at three locations within the plot, at 0-0.02, 0.02-0.1, 0.1-0.2 and 0.2-0.3 m depth. Rainfall and water added by irrigation kept the soil close to field capacity during the first weeks after the herbicide application. The climate of the area is typically Mediterranean, with 484 mm average rainfall and 1442 mm average ETr. In the three months after the herbicide application, rainfall and average air temperature were 114 mm and 17 C in April, 58 mm and 27 C in May, and 11 mm and 28 C in June. Laboratory experiments were carried out in six undisturbed soil columns (PVC cylinders, diameter 0.2 m, height 0.2 m) taken from the experimental plot before field herbicide application. The soil columns were in a lab at 20 C average temperature. Before applying the herbicide (dose equivalent to that in the field), enough water was added to the columns to reach field capacity conditions. Water was added weekly to the columns from one week after the herbicide application, to match the water amounts in the field. Water leached from the columns was sampled every week for analysis. Every 0.05 m layer of the soil columns was also sampled at the end of the leaching experiment. The herbicide residues in the soil and water samples were extracted, and analysed by HPLC. The plot has been under the same conventional tillage system since 1991, and it is nearby a similar plot that has been under reduced tillage since the same year. Our results will be compared with those from other mobility and persistence studies carried out in both plots on 1994, 1995 and 1997.
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Cuevas, M. V., Fernandez, J. E., Hermosin, M. C., Calderon, M. J., Moreno, F., Cornejo, J., & Vanclooster, M. (2002). Dissipation of trifularin under conventional tillage in southwest Spain. Book of abstracts, p. EGS02-A-04473. https://hdl.handle.net/2078.5/154047