Measurement
- Version 1 of 1
Measurement Data Component
Title: Annual N2O measurements and associated data: AC0213, Cambridgeshire, 2012
Related Party - Organisation (Author): ADAS UK Ltd.
Related Party - Organisation (Funder): Defra
Abstract:
On a commercial arable farm near Cambridge, eastern England (clay topsoil texture), direct nitrous oxide (N2O) and ammonia (NH3) emissions were measured from replicated (x3) plots (24 x 11 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), urea fertiliser (46% N) or an ammonium sulphate nitrate (ASN) fertiliser (26% N) were applied at a rate of 200 kg N/ha, in three split applications (mid-March, mid-April & early-May). In separate treatments, two commercially available nitrification inhibitors were tested; dicyandiamide (DCD) was sprayed at a rate of 10 kg/ha (6.5 kg N/ha) onto the AN and urea plots immediately after N fertiliser application, and a 3,4-dimethylpyrazole phosphate (DMPP) containing fertiliser (26% N) was also applied at a rate of 200 kg N/ha, in three split applications. The N supplied by the DCD was accounted for in the 200 kg N/ha application. Additionally, AN and urea fertiliser was also applied in five equal splits in mid-March, late-March, mid-April, late-April & early-May i.e. 'little and often'. Following N fertiliser application, measurements of direct nitrous oxide (N2O) emissions 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.3 weeks after each split N fertiliser application, using a wind tunnel technique (one per plot). Grain yields and total N offtakes were measured following harvest in August 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, 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 & uric acid-N) applied, cumulative ammonia emission, cumulative nitrate leaching loss, crop yield, crop total nitrogen offtake and crop grain nitrogen offtake. ND = not determined. NA = not applicable. DMPP = 3,4-dimethylpyrazole phosphate. '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 oxide; Ammonium nitrate; Urea; Ammonium sulphate nitrate; Nitrification inhibitors; Arable land; Clay soils; DCD; DMPP
Geographic Keywords: Cambridgeshire
Observed Properties: Ammonia emission; Application timing; Crop nitrogen offtake; Crop yield; Crops; Emission factor; Experimental blocking; Experimental treatment; Grain nitrogen offtake; 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: 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 experiment started
Geographic Extent - Longitude (West): -0.16 Longitude (East): 0.11 Latitude (South): 52.19 Latitude (North): 52.35 |
Phenomenon Time - Start Date/Time: 2012-03-13 End Date/Time: 2013-03-13
Result Time: 2013-03-13
Valid Time - Start Date/Time: 2012-03-13 End Date/Time: 2013-03-13
Feature of Interest: biosphere
Publication Date: 2017-02-03
This data is made available under the terms of the FBA Licence.
Total file downloads: 433
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