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Measurement Data Component

Title: Daily nitrous oxide flux measurements: 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. This dataset is of daily nitrous oxide flux (g N2O-N/ha/d) measurements. The first measurement is a 'background' measurement i.e. before any treatments were applied. ND = not determined. If the data file is downloaded/opened in excel, dates may appear as dd-mm-yy instead of the standard yy-mm-dd.
Subject Keywords: Nitrous oxideManufactured nitrogen fertilizersAmmonium nitrateUreaNitrification inhibitorsGrassland soilsSandy soils
Geographic Keywords: Dumfries and Galloway
Observed Properties: DateExperimental blockingExperimental treatmentNitrous oxide mass fluxYear
Parameter: Block number
Parameter: Daily nitrous oxide emission
Parameter: Measurement date
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: 2011-03-17 End Date/Time:  2012-03-08
Result Time: 2012-03-08
Valid Time -  Start Date/Time: 2011-03-17 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 Open Government Licence (Version 3).

Total file downloads: 9

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