designing and creating the north wyke farm platform · designing and creating the north wyke farm...
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Designing and creating theNorth Wyke Farm Platform
Robert Orr†, Bruce Griffith†, Steve Rose‡,David Hatch†, Jane Hawkins† & Phil Murray†
†Rothamsted Research, North Wyke, Okehampton, Devon EX20 2SB UK‡JBA Consulting, Salts Mill, Victoria Road, Saltaire, Bradford, BD18 3LF UK
The North Wyke Farm Platform
A large, farm-scale experiment - establishedduring 2010 as a UK national capability forcollaborative research, training andknowledge exchange in agro-environmentalsciences.
Addresses agricultural productivity andecosystem responses to differentmanagement practices.
Rainfall (mm)
Soils
Halstow soil seriesTopsoil: slightly stony, silty clay loam
Subsoil: moderately permeable, mottled stony clay or siltyclay; prominently mottled and slowly permeable below40cm
Hallsworth soil seriesTopsoil: slightly stony clay or clay loam
Subsoil: slowly permeable prominently mottled stony clay
Topographical survey and hydrological assessment
Position and elevation weredetermined on >6000 locationsacross the potential fields
Planning permission
• Environment Agency - Flood Defence Consent• tree species and condition survey; constraints plan in relation to Root Protection Areas• Habitat and Protected Species surveys• Environmental Impact Assessment - including Archaeological Survey and Groundworks Mitigation Plan
Greenhills Tree Services
TREE SURVEY
TREE CONSTRAINTS PLAN
BS 5837: 2005 Trees in relation to construction - Recommendations
Site Address: North Wyke ResearchOkehamptonDevonEX20 2SB
Date: 14th October 2009
Prepared by: Greenhills Tree Services – (Arboriculturist)
Prepared for: North Wyke Research – (Client)
Constraints PlanSurvey location, species, dimensions,age class, condition and remainingcontribution in years.
Protection Plan and ArboriculturalMethod StatementDocument how the trees are to beprotected from inadvertent damage.
Trees
67% high quality & value
18% moderate quality & value
10% low quality & value
5% recommended for removal
Root ProtectionArea
% oftrees
(radius inmetres)
English Oak 50 7.5Common Ash 18 5.4Beech 6 7.3Silver Birch 6 4.1Hawthorn 3 3.0Sycamore 3 6.2Goat Willow 2 4.4Common Sallow 2 4.3Holly 2 2.8
Identify RPA of those trees adjoining areas of excavation to establish whetherthere is a possible conflict with trees of landscape importance.
Trees
Trench width = pipe diameter + 100mm each side
French drains – bund and dimensions
Pipe Trenchdiameter width
(mm) (mm)100 300160 360
200 400225 425300 500375 575
400 600450 650
5056 tonnes of 20 – 50 mm clean stone
9203 metres of damp proof membrane
Back-to-back French Drains on watersheds
French drains - construction
Water flow and chemistry
Bubbler flowmeter Sequential/composite sampler
Flume area – accessed by service tracks
•Temperature•Conductivity•Turbidity•pH•Dissolved O2
•Ammonium
•Nitrate
•Total-P•Ortho-P
•DissolvedOrganic Carbon
Core water data parameters
Flow cell
Rainfall, soil moisture and soil temperature
Soil temperature and moisture probe
Rain gauge
Real-time data via RadioTelemetry
Relay station
Emissions – CO2 and N20
Photoacoustic infrared field gas monitorto measure N2O.
Three mobile laboratories – each containing anautomated soil CO2 flux system with 12 chambers
Multiplexer and analyser control unit
@farmplatform
follow us on
Baseline years – Apr 2011 to Mar 2013
Livestock continuously stocked- follow sward height guidelines
50 ewes and their twin lambs
25 yearling suckler beef cattle
200 kg N fertiliser per ha
First silage cut – 2/3rds of area
Second silage cut – 1/3rd of area
FYM applied to silage stubble
Farm gate balances:• Money• Energy• C• N• P