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B Real & J Maillet Mezeray
 

B Real & J Maillet Mezeray

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Evaluation of glyphosate loss from a maize traited field

Evaluation of glyphosate loss from a maize traited field
La Jaillière : french experimental site

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    B Real & J Maillet Mezeray B Real & J Maillet Mezeray Presentation Transcript

    • Evaluation of glyphosate loss from a maize traited field La Jaillière : french experimental site Benoît Réal, Julie Maillet-Mezeray Brussels march 23th 2010
    • Experimental plots La Jaillière Representative of the western part of France 11 plots with different rotations but no repetition Surface of the plots : 0.5 to 1 ha Type of soil : hydromorphic loam with 22 % of clay and 2.2 % of organic matter Non-drained Plot Substratum : schist at 0.80 depth m Drained Plot Annual average rainfall: 750 mm Recording Station Annual average quantity of water drained : 220 Runoff Collectors mm Ditch Grass buffer strip ⇒More than 15 000 datas concerning 68 active ingredients ⇒770 datas on glyphosate and AMPA
    • Datas collection Flow Rain water Water from drainage and run off Sunshine Temperature Practices : Applications (dates, doses) Solar Panel Data Acquisition Unit Soil Surface Automatic Sampler Runoff / Drainage water Inlet Waste Flow meter
    • Experimental trials on glyphosate. Round up Ready use simulations 3 plots 3 drained, 3 with run off, 2 ploughing, 1 no tillage Years of study: 4 Application period: June No GM maize Special sprayer
    • Evolution of concentrations of glyphosate, AMPA and drained water quantity. mm Draining water. Plot T7 (drainage / ploughing) µg/l 50 1.6 No drainage 45 During Just after 1.4 40 drainage drainage RR practices 1.2 35 19/03/2009 1 30 720 g/ha 04/06/2009 04/04/2006 720 g/ha 1215 g/ha 25 01/06/2006 1080 g/ha 0.8 13/06/2008 1080 g/ha 19/06/2009 08/06/2006 1080 g/ha 26/06/2008 1080 g/ha 1215 g/ha 06/03/2002 10/03/2004 20 720 g/ha 720 g/ha 0.6 31/03/2005 720 g/ha 15 03/06/2005 1332 g/ha 14/06/2005 1008 g/ha 0.4 10 0.2 5 0 0 28/08/2001 29/08/2002 30/08/2003 30/08/2004 31/08/2005 01/09/2006 02/09/2007 02/09/2008 Lame d'eau (mm) Application C glyphosate µg/l C AMPA µg/l ⇒ Immediate transfer of glyphosate and AMPA when application during draining period: 2002 : 0.002% of applied quantity. ⇒ RR practices: No transfer in june. Low transfer of glyphosate and AMPA in October / November ⇒ AMPA transfer lower than glyphosate ones
    • Evolution of glyphosate, AMPA's flows accumulations and drained water quantity. Draining water. Plot T7 (drainage / ploughing). During Just after mm m g/ha 1200 drainage drainage RR practices 16 14 19/03/2009 1000 720 g/ha 04/06/2009 1215 g/ha 04/04/2006 720 g/ha 19/06/2009 12 01/06/2006 1080 g/ha 13/06/2008 1080 g/ha 1215 g/ha 08/06/2006 1080 g/ha 26/06/2008 1080 g/ha 06/03/2002 10/03/2004 800 720 g/ha 720 g/ha 10 31/03/2005 720 g/ha 03/06/2005 1332 g/ha 14/06/2005 1008 g/ha 600 8 6 400 4 200 2 0 0 28/08/2001 29/08/2002 30/08/2003 30/08/2004 31/08/2005 01/09/2006 02/09/2007 02/09/2008 Drained water quantity (mm) Application Glyphosate's flow mg/ha AMPA's flow mg/ha ⇒ Flow / Applied quantity: 0.00012 % during the whole experimentation. ⇒ Lower with RR practices.
    • Evolution of concentrations of glypohosate, AMPA and drained water quantity. mm Drained water. Plot T8 (drainage / no tillage). µg/l 50 1.6 45 Just after 1.4 drainage RR practices 40 1.2 35 19/03/2009 720 g/ha 1 30 13/06/2008 02/06/2009 04/04/2006 720 g/ha 1080 g/ha 1215 g/ha 25 26/06/2008 19/06/2009 0.8 10/03/2004 01/06/2006 1080 g/ha 08/06/2006 1080 g/ha 1080 g/ha 1215 g/ha 720 g/ha 16/03/2007 20 720 g/ha 31/03/2005 720 g/ha 0.6 03/06/2005 1332 g/ha 15 14/06/2005 1008 g/ha 0.4 10 0.2 5 0 0 28/08/2001 29/08/2002 30/08/2003 30/08/2004 31/08/2005 01/09/2006 02/09/2007 02/09/2008 Lame d'eau (mm) Application C glyphosate µg/l C AMPA µg/l ⇒ Same pattern in no tillage. ⇒ RR practices: transfer >0.001 % of applied quantity.
    • Evolution of flows accumulations of glyphosate, AMPA and drained water quantity. Draining water. Plot T9 (drainage/ploughing/buffer strip 2004) mm µg/l 50 First degradation after 1.6 application 45 Application 2 1.4 RR practices years before. 40 1.2 35 19/03/2009 1 30 720 g/ha 04/06/2009 04/04/2006 720 g/ha 1215 g/ha 25 13/06/2008 1080 g/ha 0.8 01/06/2006 1080 g/ha 19/06/2009 26/06/2008 1080 g/ha 08/06/2006 1080 g/ha 1215 g/ha 06/03/2002 10/03/2004 20 720 g/ha 720 g/ha 31/03/2005 720 g/ha 0.6 03/06/2005 1332 g/ha 15 14/06/2005 1008 g/ha 0.4 10 0.2 5 0 0 28/08/2001 29/08/2002 30/08/2003 30/08/2004 31/08/2005 01/09/2006 02/09/2007 02/09/2008 Lame d'eau (mm) Application C glyphosate µg/l C AMPA µg/l ⇒ Same transfer pattern
    • Evolution of concentrations of glyphosate, AMPA and run off water quantity. Run off water. Plot T8 (run off / no tillage). mm Just after drainage RR practices µg/l 3.0 1.80 1.60 2.5 04/04/2006 720 g/ha 13/06/2008 01/06/2006 1080 g/ha 1080 g/ha 1.40 08/06/2006 1080 g/ha 16/03/2007 26/06/2008 10/03/2004 720 g/ha 1080 g/ha 720 g/ha 2.0 1.20 31/03/2005 720 g/ha 19/03/2009 03/06/2005 1332 g/ha 720 g/ha 14/06/2005 1008 g/ha 02/06/2008 1.00 1.5 1215 g/ha 19/06/2009 1215 g/ha 0.80 1.0 0.60 0.40 0.5 0.20 0.0 0.00 28/08/2001 29/08/2002 30/08/2003 30/08/2004 31/08/2005 01/09/2006 02/09/2007 02/09/2008 Run off water (mm) Application C glyphosate µg/l C AMPA µg/l ⇒ Same pattern of transfer ⇒Concentrations can be higher than in drainage but always below PNEC (60 g/l; AFSSA opinion)
    • Evolution of flows accumulations of glyphosate, AMPA and run off water quantity. mm Run off water. Plot T8 (run off / no tillage). mg/ha 60.0 7.0 Just after drainage 6.0 50.0 RR practices 5.0 40.0 19/03/2009 4.0 720 g/ha 30.0 02/06/2009 13/06/2008 04/04/2006 720 g/ha 1215 g/ha 1080 g/ha 01/06/2006 1080 g/ha 19/06/2009 3.0 26/06/2008 10/03/2004 08/06/2006 1080 g/ha 1215 g/ha 1080 g/ha 720 g/ha 16/03/2007 20.0 720 g/ha 31/03/2005 720 g/ha 2.0 03/06/2005 1332 g/ha 14/06/2005 1008 g/ha 10.0 1.0 0.0 0.0 28/08/2001 29/08/2002 30/08/2003 30/08/2004 31/08/2005 01/09/2006 02/09/2007 02/09/2008 Lame d'eau (mm) Application Flux glyphosate mg/ha Flux AMPA mg/ha ⇒ Higher concentrations than in drained water but, lower flows ⇒ Drained plots : more transfers in drainage water than in run off water.
    • Average glyphosate transfer by drainage and average applied rates. Flows (mg/ha) Various application periods. Doses (g/ha) 1200 3500 Etiquettes de données : Nombre d'analyses 3000 1000 39 2500 800 2000 600 1500 400 15 1000 200 500 19 4 11 3 0 0 September October February March beginning mid-March April Average transfered flow Average applied doses ⇒ When soil is watersatured (winter until mid-March), the transfers of glyphosate are possible and more important.
    • Synthesis of all the results Western france - hydromorphic loam Without drainage network, transfers of glyphosate could be important: up to 100 % detections in runoff water, concentration peak up to 50 g/L, maximum flow up to 5 g/ha. With drainage network, transfers of glyphosate are less important: up to 70 % detections, concentration peak 12 g/L, maximum flow 1.5 g/ha. When the soil is watersatured (winter until mid-March), transfers of glyphosate are possible and more important.
    • Synthesis of all the results Western france - hydromorphic loam The applications of glyphosate in may - june (RR practices) don’t cause immediate transfers by drainage or runoff Drainage and runoff during the autumn after RR applications of glyphosate don’t cause important transfer of glyphosate and AMPA Results in term of concentration, flow and kinetics to be confirmed in other soil and climatic conditions
    • ARVALIS experimental sites dedicated to the pesticide transfers Thibie : 28 lysimeters Geispitzen 3 plots : runoff La Jaillière 11 plots : drainage and runoff LSE : 26 lysimeters Le Magneraud 14 lysimeters Parisot 3 plots : drainage runoff Auradé 4 plots : runoff