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N. Beaudoin 1 , B. Mary 1 , P. Durand 2 , J.M. Machet 1 & B. Nicolardot 1

N. Beaudoin 1 , B. Mary 1 , P. Durand 2 , J.M. Machet 1 & B. Nicolardot 1 1 INRA - Unité d’agronomie de Laon-Reims-Mons, France 2  INRA - UMR S.A.S, Rennes, France. Nitrate concentration in soils and subsoils as affected by farming practices in intensive agricultural areas.

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N. Beaudoin 1 , B. Mary 1 , P. Durand 2 , J.M. Machet 1 & B. Nicolardot 1

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  1. N. Beaudoin 1, B. Mary 1, P. Durand 2, J.M. Machet 1 & B. Nicolardot1 1 INRA - Unité d’agronomie de Laon-Reims-Mons, France 2 INRA - UMR S.A.S, Rennes, France Nitrate concentration in soils and subsoils as affected by farming practices in intensive agricultural areas 14th N WORKSHOP N management in Agrosystems in Relation to the Water Framework Directive 24-26 October 2005, Maastricht, The Netherlands

  2. 600 500 400 kg N mineralised ha-1 300 200 100 0 Feb.-97 Aug.-97 Feb.-98 Aug.-98 Feb.-99 Effect on the destruction on soil net N mineralisation andthe potential risk of N leaching N dynamics in the RZ – Agricultural Practices From Vertes et al., 2002

  3. 40 80 30 60 kg N ha-1 kg N ha-1 20 40 10 20 0 0 No CC CC No CC CC Effect of the presence of catch crop on the amounts of N leached N dynamics in the RZ – Agricultural Practices Continuous barley, 5 years study, D=635 mm, Denmark Hansen & Djurhuus, 1996 Sugar beet-Wheat-pea, 10 years study, D=125 mm, France Mary et al., 2002

  4. 160 Ropsley 1977-1992 UK 1941-1992 120 80 N balance (kg N ha-1) 40 G + I +L 0 0 80 160 240 -40 N rate (kg N ha-1) Effect of increased fertilisation on N balance (Inputs – Exportations) From Davies & Sylvester-Bradley, 1995 N dynamics in the RZ – N leaching & N balance G = gaseous losses, I = soil N immobilization, L= leaching losses

  5. Organic fertilisation and rotation N balance N balance 120 60 50 80 kg N ha-1 kg N ha-1 40 40 30 0 20 10 -40 Min N + Min N + Slurry + Slurry + 0 rotation maize rotation maize N 0.65N N + 0.65N + CC CC Nitrate concentration 120 Nitrate concentration 70 100 60 mg NO3- L-1 mg NO3- L-1 80 50 60 40 30 40 20 20 10 0 0 Min N + Min N + Slurry + Slurry + N 0.65N N + 0.65N rotation maize rotation maize CC + CC Mary et al., 2002 Van Dijk et al., 2003 Relationships between N balance and nitrate losses Mineral fertilisation and catch crops N dynamics in the RZ – N leaching & N balance

  6. 300 250 Leaching 200 kg N ha-1 y-1 Denitrification Source: Institut de l’élevage, Paris 150 Volatilization 100 N immobilization 50 0 Inputs - crop Losses exportation Explicitation of N balance with N losses and N storage in soil organic matter From Wolf et al., 2005 N dynamics in the RZ – N leaching & N balance

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