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Measurement Data Component

Title: Annual N2O measurements and associated data: AC0116, Herefordshire, 2011
Related Party - Organisation (Author): ADAS
Related Party - Organisation (Funder): Defra
Related Party - Organisation (Funder): Scottish Government
Related Party - Organisation (Funder): Welsh Assembly Government
Related Party - Organisation (Funder): DAERA Northern Ireland
Abstract:
On a commercial farm near Preston Wynne, west England (clay loam topsoil texture), direct N2O-N emissions were measured from replicated (x3) plots (6 x 12 m) following spring applications of manufactured nitrogen (N) fertilisers to winter wheat. A control treatment was included where no N fertiliser was applied. Ammonium nitrate (AN) fertiliser (34.5% N) was applied at 5 different rates; 60, 120, 180, 240 and 300 kg N/ha, and urea fertiliser (46% N) at a rate of 240 kg N/ha, in three split applications (early-March, early-April and early-May). In separate AN and urea treatments, a commercially available nitrification inhibitor was tested; dicyandiamide (DCD) was sprayed at a rate equivalent to 10 kg DCD/ha onto the plots immediately after each N fertiliser application. The N supplied by the DCD was accounted for in the total N application of 240 kg N/ha, which was applied in three splits. A DCD only treatment was also included, where DCD was sprayed onto the soil surface in three split applications giving a total N application of 20 kg/ha. Additionally, AN fertiliser was also applied in five equal splits in mid-March, early-April, mid-April, early-May and mid-May 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. Grain yields and total N offtakes were measured following harvest in August 2011. 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, crop type, previous crop type, 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, block number, total nitrogen applied, readily available nitrogen (i.e. if present, the sum of ammonium-N and nitrate-N) applied, cumulative ammonia emissions, cumulative nitrate leaching loss, crop yield, crop total nitrogen offtake and crop grain 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. The cumulative N2O emissions have been corrected to 365 days, while daily data was measured for 363 days.
Subject Keywords: Nitrous oxideAmmonium nitrateUreaNitrification inhibitorsArable landClay soils
Geographic Keywords: Herefordshire
Observed Properties: Ammonia emissionApplication timingCrop nitrogen offtakeCrop yieldCropsEmission factorExperimental blockingExperimental treatmentGrain nitrogen offtakeNitrate leachingNitrogen sourceNitrous oxide mass fluxRainfallReadily available-nitrogenSoil clay contentSoil dry bulk densitySoil organic carbonSoil pHSoil textureTotal nitrogenYear
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 (85% dry matter)
Parameter: Cumulative ammonia emission
Parameter: Cumulative nitrate leaching loss
Parameter: Grain nitrogen offtake
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 of measurement

Geographic Extent -
    Longitude (West): -2.78
    Longitude (East): -2.51
    Latitude (South): 52.03
    Latitude (North): 52.20

Phenomenon Time -  Start Date/Time: 2011-03-09 End Date/Time:  2012-03-05
Result Time: 2012-03-05
Valid Time -  Start Date/Time: 2011-03-09 End Date/Time:  2012-03-05
Feature of Interest: biosphere
Publication Date: 2017-04-05

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

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