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Measurement Data Component

Title: Annual N2O measurements and associated data: AC0213, Nottinghamshire, 2011
Related Party - Organisation (Author): ADAS UK Ltd.
Related Party - Organisation (Funder): Defra
Abstract:
On a commercial dairy farm near Newark, central England (clay loam topsoil texture), direct nitrous oxide (N2O) and ammonia (NH3) emissions were measured from replicated (x3) plots (12 x 14 m) following spring applications of manufactured nitrogen (N) fertilisers to grassland. A control treatment was included where no N fertiliser was applied. Ammonium nitrate (AN) fertiliser (34.5% N) or urea fertiliser (46% N) was applied at a rate of 120 kg N/ha in two equal split applications (late-February and late-March), with or without the commercially available nitrification inhibitor - dicyandiamide (DCD). The DCD was applied in a solution (15 kg DCD/ha) and sprayed onto the plots immediately after N fertiliser application. The N supplied by the DCD was accounted for in the 120 kg N/ha. As separate treatments, AN and urea fertiliser were also applied in four equal splits in late-February, early-March, late-March and early-April i.e. 'little and often'. Following N fertiliser application, measurements of direct N2O-N were made over c.12 months, using 5 static chambers (0.8 m2 total surface area) per plot and analysed by gas chromatography. Ammonia-N emissions were measured for c.2 weeks after each split N fertiliser application, using a wind tunnel technique (one per plot). Soil moisture (0-10 cm) and soil mineral nitrogen contents (0-10 cm) (2-split AN & control treatments only) were measured at every N2O sampling event, along with continuous measurements of rainfall, air and soil temperatures (5 cm). Grass yields and N offtakes were also measured following the first and second grass cuts in May and July 2012. Where measured, this dataset contains: annual nitrous oxide emissions (kg N2O-N/ha/year), annual nitrous oxide emission factors (% of total nitrogen applied), year experiment started, site location, crop type, previous crop type, age of grass ley, soil texture, soil clay content, soil dry bulk density, soil organic carbon content, soil pH, total rainfall during the experimental period, nitrogen source, experimental treatments, application timing, application method, block number, total nitrogen applied, readily available nitrogen (i.e. if present, ammonium-N, nitrate-N and uric acid-N) applied, cumulative ammonia emission, cumulative nitrate leaching loss, crop yield and crop total nitrogen offtake. ND = not determined. NA = not applicable. 'Rainfall during the experimental period' = cumulative rainfall from the first day of fertiliser application to the last day of N2O sampling. The N2O emission factors are calculated using annual cumulative N2O values to 15 decimal places, however the annual cumulative N2O and emission factor values have been reported to 2 decimal places.
Subject Keywords: Nitrous oxideAmmonium nitrateUreaNitrification inhibitorsGrassland soilsClay soils
Geographic Keywords: Nottinghamshire
Observed Properties: Ammonia emissionApplication timingCrop nitrogen offtakeCrop yieldCropsEmission factorExperimental blockingExperimental treatmentGrass ley ageNitrate leachingNitrogen sourceNitrous oxide mass fluxRainfallReadily available-nitrogenSoil clay contentSoil dry bulk densitySoil organic carbonSoil pHSoil textureTotal nitrogenYear
Parameter: Age of grass ley
Parameter: Annual nitrous oxide emission
Parameter: Annual nitrous oxide emission factor (% of total nitrogen applied)
Parameter: Application timing
Parameter: Block number
Parameter: Clay content
Parameter: Crop total nitrogen offtake
Parameter: Crop type
Parameter: Crop yield
Parameter: Cumulative ammonia emission
Parameter: Cumulative nitrate leaching loss
Parameter: Nitrogen source
Parameter: Previous crop type
Parameter: Rainfall during the experimental period
Parameter: Readily available-nitrogen applied
Parameter: Soil dry bulk density
Parameter: Soil organic carbon
Parameter: Soil pH
Parameter: Soil texture
Parameter: Total nitrogen applied
Parameter: Treatment
Parameter: Year experiment started

Geographic Extent -
    Longitude (West): -1.00
    Longitude (East): -0.73
    Latitude (South): 53.00
    Latitude (North): 53.16

Phenomenon Time -  Start Date/Time: 2011-02-22 End Date/Time:  2012-02-17
Result Time: 2012-02-17
Valid Time -  Start Date/Time: 2011-02-22 End Date/Time:  2012-02-17
Feature of Interest: biosphere
Publication Date: 2017-02-03

This data is made available under the terms of the Open Government Licence (Version 3).

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