Measurement
- Version 1 of 1
Measurement Data Component
Title: Annual N2O measurements and associated data: AC0116, Dumfries, 2011
Related Party - Organisation (Author): SRUC
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:
At the SRUC Crichton research farm near Dumfries, south-west Scotland (sandy loam topsoil texture), direct N2O-N emissions were measured from replicated (x3) plots (2 x 16 m) following spring applications of manufactured nitrogen (N) fertilisers to permanent grassland. A control treatment was included where no N fertiliser was applied. Ammonium nitrate (AN) fertiliser (34.5% N) was applied at 5 different rates; 80, 160, 240, 320 and 400 kg N/ha, and urea fertiliser (46% N) at a rate of 320 kg N/ha, in four split applications (late-March, mid-April, mid-May and early-July). 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 320 kg N/ha, which was applied in four splits. A DCD only treatment was also included, where DCD was sprayed onto the soil surface in four split applications giving a total N application of 26 kg/ha. Additionally, AN fertiliser was also applied in six splits in late-March, early-April, mid-April, late-April, mid-May and early-July; the first four splits were of 30-40 kg/N ha i.e. ‘little and often’. Following N fertiliser application, measurements of direct N2O-N were made over c.12 months, using 5 static chambers (0.63 m2 total surface area) per plot and analysed by gas chromatography. Grass yields and N offtakes were also measured following grass cuts in mid-May, late-June and mid-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, 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, 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 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 elsewhere to 2 decimal places. The cumulative N2O emissions have been corrected to a 365 day measurement period.
Subject Keywords: Nitrous oxide; Manufactured nitrogen fertilizers; Ammonium nitrate; Urea; Nitrification inhibitors; DCD; Grassland soils; Sandy soils
Geographic Keywords: Dumfries and Galloway
Observed Properties: Ammonia emission; Application timing; Crop nitrogen offtake; Crop yield; Crops; Emission factor; Experimental blocking; Experimental treatment; Grass ley age; Nitrate leaching; Nitrogen source; Nitrous oxide mass flux; Rainfall; Readily available-nitrogen; Soil clay content; Soil dry bulk density; Soil organic carbon; Soil pH; Soil texture; Total nitrogen; Year
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): -3.72 Longitude (East): -3.46 Latitude (South): 54.97 Latitude (North): 55.13 |
Phenomenon Time - Start Date/Time: 2011-03-22 End Date/Time: 2012-03-08
Result Time: 2012-03-08
Valid Time - Start Date/Time: 2011-03-22 End Date/Time: 2012-03-08
Feature of Interest: biosphere
Publication Date: 2017-04-05
This data is made available under the terms of the FBA Licence.
Total file downloads: 355
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