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University of Extremadura, Forestry School of Plasencia

University of Extremadura, Forestry School of Plasencia. The role of trees for Nitrate leaching after Organic and Mineral fertilization. ML López-Díaz, G Moreno, V Rolo. Introduction. Agriculture. Directive 80/788/CEE. Fertilization rate.

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University of Extremadura, Forestry School of Plasencia

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  1. Universityof Extremadura, ForestrySchoolofPlasencia The role of trees for Nitrate leaching after Organic and Mineral fertilization ML López-Díaz, G Moreno, V Rolo

  2. Introduction Agriculture Directive 80/788/CEE Fertilization rate Nitrate leaching Irrigation systems Directive 91/676/CEE Underground water

  3. Introduction PROBLEM Nitrate leaching SOLUTION Agroforestry Systems Organic Fertilization Tree – pasture root system Gradual N mineralization LIXIVIATED NITRATE

  4. Aims

  5. Materials and Methods Systems D  Bare soil P  Pasture S  Tree SP  Tree & pasture Fertilization NF  No fertilize L  Sewage Sludge M  Mineral Greenhouse experiment n = 6 120 pots: 20 cm Ø, 120 cm height Soil: pH 4.7; 1 g N kg-1; 10 g Organic C kg-1

  6. Materials and Methods Tree Basal Diameter Pasture Production Parameters analyzed Profile of Nitrate Content Nitrate Lixiviated Rooting profile

  7. Results & Discussion NO3- Content in the Soil Profile NO3- , mg / Kg soil NO3- , mg / Kg soil Depth, cm Depth, cm Systems D  Bare soil P  Pasture S  Tree SP  Tree & pasture Fertilization Treatments NF  No fertilize M  Mineral L  Sewage Sludge

  8. Results & Discussion Nitrate Lixiviation and Fertilization Rates Fertilization Nitrate, g /m2 Date Nitrate, g /m2 Fertilization Treatments NF  No fertilize M  Mineral L  Sewage Sludge 2006 2007 Fertilization Treatment

  9. Results & Discussion Nitrate Lixiviation and Systems Fertilization Nitrate, g /m2 Nitrate, g /m2 System Date Systems D  Bare soil P  Pasture S  Tree SP  Tree & pasture 2006 2007

  10. Results & Discussion Root system Pasture Tree

  11. Results & Discussion Production

  12. Conclusions The use of agroforestry systems are a good tool to control the nitrate leaching adjusting properly the fertilization rate to minimize the competitive effect between vegetation layers

  13. THANKS FOR YOUR ATTENTION Victor Rolo

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