Measurement
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Measurement Data Component
Title: Daily nitrous oxide flux measurements: AC0116, Ceredigion, 2013, urine
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:
An experiment was carried out near Aberaeron, mid Wales (clay 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) and cattle dung (at 20 kg/m2) was applied to grassland in mid-April (spring), early-July (summer) and in mid-September (autumn) 2013. 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 lactating dairy cows at Reading University, 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 0.8 m2) and analysed by gas chromatography. Similarly, dung was applied in five patches (40 cm x 40 cm) so that each patch was completely enclosed by a nitrous oxide static chamber. Reference: Kool, D.M., Hoffland, E., Abrahamse, P.A and 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 oxide; Urine; Dung; Synthetic urine; Nitrification inhibitors; DCD; Grassland soils; Clay soils
Geographic Keywords: Ceredigion
Observed Properties: Date; Experimental blocking; Experimental treatment; Nitrous oxide mass flux; Year
Parameter: Block number
Parameter: Daily nitrous oxide emission
Parameter: Measurement date
Parameter: Treatment
Parameter: Year experiment started
Geographic Extent - Longitude (West): -4.30 Longitude (East): -4.03 Latitude (South): 52.14 Latitude (North): 52.30 |
Phenomenon Time - Start Date/Time: 2013-04-05 End Date/Time: 2014-08-27
Result Time: 2014-08-27
Valid Time - Start Date/Time: 2013-04-05 End Date/Time: 2014-08-27
Feature of Interest: biosphere
Publication Date: 2017-04-05
This data is made available under the terms of the FBA Licence.
Total file downloads: 99
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