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2 February 2022, 14h – 17h CET

The webinar will discuss:
i) relationships between draw-down of soil P and crop productivity
ii) relationships between draw-down of soil P and diffuse P losses from agricultural soils

This ESPP webinar will follow on from the SPA (US) webinar “A Legacy of Phosphorus”, 30th September 2021, 18h-19h30 CEST and from the Frontiers in Earth Science special on ‘Legacy Phosphorus’ summarised in ESPP eNews n°56

A SCOPE Newsletter Special Issue will summarise this ESPP webinar and will also include selected further abstracts submitted as well as a c. 20 relevant recent scientific publications.

Online. Free. Register here

14h00 – 14h30 (4 x 5 min + 10 mins discussion)
Opening: What do we mean by “legacy P”?
Chair: Christiana Staudinger, Jakob Santner, University of Natural Resources and Life Sciences, Austria

  • Phil Haygarth, Lancaster University, UK - European perspective
  • Andrew Sharpley, University of Arkansas, US - Phosphorus Legacies: Redefining the scientific, economic, and policy nexus to mitigate future water resource impairment
  • Achim Dobermann, IFA (International Fertilizer Association) – Industry perspective
  • Rich McDowell, AgResearch: New Zealand perspective: predicting soil P changes if fertiliser use is stopped, agronomic and environmental targets

14h30 – 15h00 (5 x 4 min + 10 mins discussion)
Europe: impacts of drawing down legacy P on crop yields (long-term trials)
Chair: Jakob Santner, University of Natural Resources and Life Sciences, Austria

  • Inge Regelink, Wageningen University Research, Netherlands: 17 years trials on grassland in The Netherlands
  • Debby Van Rotterdam, Nutrient Management Institute, Netherlands - Legacy soil P: a mass balance approach in a 10- year mining experiment
  • Agnieszka Rutkowska, State Research Institute for Soil Science and Plant Cultivation, Poland - Long term effect of unbalanced fertilization with phosphorus and nitrogen – a case study for Poland
  • Sabina Braun, Swedish University for Agricultural Sciences, Sweden - Grain yields and soil P changes from >50 years of soil fertility field experiments
  • Vladimir Nosov, PhosAgro, Russia - Sustainable crop production: decreasing phosphorus rates or splitting phosphorus application?

15h00 – 15h40 (8 x 3 min + 15 mins discussion)
Worldwide: legacy P, draw down, soil phosphorus
Chair: Steve Hallam, International Fertiliser Society

  • Yu Gu, Wageningen University Research, Netherlands - Potential of soil phosphorus saturation index for evaluating crop yield and runoff risks
  • Amy Shober, University of Delaware, US - Corn and soybean yield across continuum of soil test phosphorus concentrations under long-term drawdown
  • Emileigh Lucas – University of Maryland, US - Lessons from manure-applied “legacy-P” drawdown in the mid-Atlantic coastal plain, USA
  • Andrew Margenot, University of Illinois, US - Legacy phosphorus drawdown at decadal to centennial scales in the U.S. Maize Belt
  • Tiequan Zhang, Harrow R&D Centre Agi-Food Canada - Legacy phosphorus in soils sustained crop yields with reduced soil phosphorus loss for 14 years
  • Barbara Cade-Menun, Agriculture and Agri-Food Canada - Soil phosphorus concentrations and wheat yields in a long-term fertilization study in Saskatchewan
  • Paulo Pavinato, University of Sao Paulo, Brazil - Legacy P availability in Brazilian tropical soils for sustainable crop production

15h40 – 15h50 – break

15h50 – 16h20 (3 x 5 min, 10 min questions)
How does legacy P or draw-down impact losses to surface waters?
Chair: Ludwig Hermann, ESPP & Proman Consulting

  • Victoria Barcala, Deltares, The Netherlands: Processes controlling the flux of legacy phosphorus to surface waters at the farm scale
  • Juliane Hirte, Agroscope, Switzerland - Reducing legacy soil phosphorus to tolerable levels for surface waters: A case study from Switzerland
  • Sarah Stackpoole, US Geological Survey - Legacy and contemporary phosphorus contributions influence river water quality trends in the conterminous United States

16h20 – 17h00 (8 x 2 minutes, 20 mins discussion)
Conclusions from panel of experts
Chair: Steve Hallam, International Fertiliser Society

Panellists are invited to draw conclusions (and future perspectives), 2 min each, and also to monitor and animate the discussion in the Chat and in the above questions/discussion sessions.

  • Jim Elser
  • Tiffanie Stephani, Yara and Fertilisers Europe
  • Luke Gatiboni
  • Marzena Smol
  • Antonio Delgado
  • Kari Ylivainio
  • Leonardus Vergutz

The programme is available in pdf here.

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