PE0111 Factors controlling P loss within and from agricultural fields Martyn Silgram 012002062003 ma

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PE0111 Factors controlling P loss within and
from agricultural fieldsMartyn Silgram
01/2002-06/2003
martyn.silgram_at_adas.co.uk

• Aims
• Characterise effect of slope and tramline
  wheelings on runoff, sediment and P loss
• Laboratory (NSRI) and Field (ADAS) scale elements

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Main messages

• Slope form (lab scale) losses linear gt convex gt
  concave for sediment (Plt0.01) and TP
  concentrations (Plt0.001)
• Slope length suggestion of carrying capacity
• Tramlines increased runoff, sediment and TP
  concentrations (Plt0.001) and decreased TDP
  concentrations (Plt0.01)
• Results help characterise processes, inform model
  representation and parameter identification, and
  support model testing (e.g. PSYCHIC)

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Co-ordination opportunities

• Links with model frameworks (e.g. PSYCHIC)
• Test site for tackling follow-on questions and
  upscaling

Research priorities for the future

• Longer slopes carrying capacity?
• Confirmation lab-based slope form effects at
  field scale
• Interaction with soil type, slope angle, and
  management practices (e.g. rolling) on runoff,
  sediment and P loss (to generalise effects for
  models)
• Effectiveness of practical mitigation options
  (tramlines)