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Measurement Data Component

Title: Daily nitrous oxide flux measurements: AC0116, Dumfries, 2012, urine
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:
An experiment was carried out at the SRUC Crichton research farm near Dumfries, south-west Scotland (sandy loam topsoil texture) using small field plots (3 x 6 m) arranged in a randomised block design with three replicates per treatment. Cattle urine (at 5 L/m2), synthetic urine (at 5 L/m2 in summer & autumn and c.1.7 L/m2 in spring) and cattle dung (at 20 kg/m2) was applied to permanent grassland in early-April (spring), late-June (summer) and in early-October (autumn) 2012. The synthetic urine was prepared using the formulation described for “R2” in the paper by Kool et al., (2006). A control treatment was included where no urine or dung was applied. In a separate treatment, a commercially available nitrification inhibitor was tested; dicyandiamide (DCD) was pre-mixed with the urine prior to application to give an application rate of 10 kg /ha for the DCD. The urine and dung was collected from dairy cows at the SRUC Crichton Dairy Research Center, kept refrigerated at <4°C and applied within seven days of collection. Following urine application to five 0.36 m2 areas of the plot (‘urine patches’), measurements of direct N2O-N were made over c.12 months, using 5 static chambers (1 per 0.36 m2 area, giving a total chamber surface area of 0.63 m2) and analysed by gas chromatography. Similarly, dung was applied in five circular patches (0.126 m2) so that each patch was completely enclosed by a nitrous oxide static chamber. Reference: Kool, D.M., Hoffland, E., Abrahamse, P.A & van Groenigen, J.W. (2006). What artificial urine composition is adequate for simulating soil N2O fluxes and mineral N dynamics Soil Biology and Biochemistry 38, 1757-1763. 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. 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 oxideUrineDungSynthetic urineNitrification inhibitorsDCDGrassland 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): -3.49
    Longitude (East): -3.21
    Latitude (South): 54.97
    Latitude (North): 55.11

Phenomenon Time -  Start Date/Time: 2012-03-30 End Date/Time:  2013-09-25
Result Time: 2013-09-25
Valid Time -  Start Date/Time: 2012-03-30 End Date/Time:  2013-09-25
Feature of Interest: biosphere
Publication Date: 2017-04-05

This data is made available under the terms of the FBA Licence.

Total file downloads: 76

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