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Alachlor and Bentazone Losses from Subsurface Drainage of Two Soils

S. Dousset*,a, M. Babutb, F. Andreuxa and M. Schiavonc

a UMR GéoSol-Microbiologie des Sols INRA A111, Université de Bourgogne, Centre des Sciences de la Terre, 6, boulevard Gabriel, 21 000 Dijon, France
b Biologie des Systèmes Aquatiques-CEMAGREF, 3, bis quai Chauveau, 69336 Lyon Cedex 09, France
c Laboratoire Sols et Environnement-ENSAIA-INRA/INPL, BP 172, 54505 Vandoeuvre-lès-Nancy Cedex, France



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Fig. 1. Location map and layout of subsurface drain system in the experimental drainage field.

 


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Fig. 2. Monthly precipitation at Champenoux (2 km from the experimental site) during the monitoring period (1992–1994). The solid line shows the 29-yr average from 1972 to 2000 at Tomblaine meteorological station (8 km from the experimental site).

 


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Fig. 3. Cumulative rainfall (—) and drain discharge versus time for the silty clay (—{circ}—) and silt loam (—{square}—) soils.

 


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Fig. 4. Alachlor (–––) and bentazone (—) discharges vs. cumulative drainage for the two studied soils during the monitoring period (1992–1994).

 


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Fig. 5. Cumulative alachlor (—{circ}—) and bentazone (—{square}—) losses vs. cumulative drainage of the silty clay and silt loam soils during the monitoring period (1992–1994).

 





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