Danish efforts to reduce p loss from agriculture to the aquatic environment
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Danish efforts to reduce P loss from agriculture to the aquatic environment. Gitte Rubæk Danish Institute of Agricultural Sciences. Imported animal feed. P import (1000 tonnes). Mineral fertilizers. Waste products. P surplus (Kg P ha -1). (Kyllingsbæk, 2005).

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Danish efforts to reduce P loss from agriculture to the aquatic environment

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Danish efforts to reduce p loss from agriculture to the aquatic environment

Danish efforts to reduce P loss from agriculture to the aquatic environment

Gitte Rubæk

Danish Institute of Agricultural Sciences


The p surplus in danish agriculture

Imported animal feed

P import

(1000 tonnes)

Mineral fertilizers

Waste products

P surplus

(Kg P ha-1)

(Kyllingsbæk,

2005)

The P surplus in Danish Agriculture


The p surplus in danish agriculture1

Depth (cm)

1,4 tonnes P ha-1 has accumulated in on agricultural land

Agricult.

Forest

Total P (mg P/kg jord)

The P surplus in danish agriculture

P overskud (kg P / ha)


Geographic distribution of the p surplus

Geographic distribution of the P surplus

P surplus in 2001

(kg ha-1 agricultural land)

(Dalgård et al., 2004)


Very high spatial variability in p losses from land

Very high spatial variability in P losses from land

Critical source area

Transport

Source

område med

Areas with a

high potential

for P transport

område

Areas with a

high content of

potentially mobile P

højt indhold af

med højt

flytbart

transport

-

fosfor

potentiale


P losses in landscape

P losses in landscape

Surface run-off

2 m uncultivated zone

(Law enforced)

Buffer Zone

(P deposition)

Soil erosion

Leaching and potential loss

through drainage system

Meadows, occasionally flooded

(P deposition)

Stream Banks

(source)

Cultivated land

(source area)

Stream

Drained low-land soil

(Source area)


P discharge to coastal waters in dk

P discharge to coastal waters in DK

Waste water

Industry

Fish hatchery

Farm contribution

Diffuse losses, cropped land

(after Rüegg og Østergaard, 2002)


P loss from farmland to surface waters in dk estimates

P loss from farmland to surface watersin DK - estimates

Certainty of estimate: (+) = Incufficient; (+++) = average; (+++++) = high

Total P (tonnes year-1)

Erosion-related losses 287 - 695

  • Water erosion (++) 7 - 35

  • Stream bank erosion (++) 275 - 645

  • Wind erosion (+) 5 – 15

    Drainage related leaching, total 65 - 405

  • Leaching from high risk areas (mineral soils) (+) 15 - 90

  • Leaching from other areas (mineral) (+++) 20 - 90

  • Leaching from lowland organic soils (+) 30 – 225

    Groundwater related leaching, total 125 - 210

  • Leaching to shallow ground water (++) 80

  • Leaching to deeper ground water(++) 45 – 130

    Atmospheric deposition (++++) < 5

    SUM (without leaching to deep ground water) 440 - 1180

Kronvang & Rubæk, 2005


Experts conclusions during the preparations for vmpiii

“Experts” conclusions during the preparations for VMPIII

A dual strategy combining:

  • General measures to reduce the P surplus and optimizing P distribution on farmland

    • Improved feeding (Digestibility, phytase additions, reduced safety margins based on improved knowledge of physiological need)

  • Targeted measures to reduce P losses from high-risk areas (critical source areas)

Poulsen and Rubæk, 2005,

DIAS report nr 68


The danish action plans v and m ilj p laner

The Danish Action Plans (Vand-Miljø-Planer)

  • VMP-I and VMP-II had focus on:

    • N emissions from agriculture

    • P emissions from point sources

  • The VMPIII addresses:

    • The P surplus in agriculture

    • The P losses from farmland

    • …and N leaching, vulnerable nature, organic farming and a “slurry action plan”


The political agreement on p in vmpiii

The political agreement on P in VMPIII

  • 50% reduction in the annual P surplus

    • tax on feed-phosphates

    • improved utilization of animal feed P

  • Buffer zones along streams and lakes

    • volunteer subsidized agreements (MVJ)

    • 10 meter zones, 50.000 ha

  • Research and development…..


P related research and development in vmpiii

P related research and development in VMPIII

  • Reducing the P surplus

    • P utilization in animal husbandry

    • Slurry treatment - including combustion

  • “Land management”

    • A Danish P index

    • Management of Stream Banks, Buffer zones, Flood plains and low land

    • Management on farmland

    • Modeling P effects in estuaries

    • Cost and benefits of mitigation strategies

    • A web-based interactive tool for N and P management of watersheds


Land management research projects

Land management research projects

A Danish

P index

Management

on farmland

Mapping layers,

mapping

techniques

Interactive

web-based

tool for nutrient

management

Management

of buffer zones,

stream banks,

floodplains and

lowlands

Modeling P effects

in estuaries

Costs and

Benefits of

mitigation strategies


Silkeborg 3 7 sep 2007

Silkeborg, 3-7 sep 2007


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