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Measurement Data Component

Title: Annual N2O measurements and associated data: AC0213, Devon, 2012
Related Party - Organisation (Author): Rothamsted Research - North Wyke
Related Party - Organisation (Funder): Defra
At a grassland site near Rothamsted Research, North Wyke in south-west England (sandy clay loam topsoil texture) small field plots (10 x 3 m) were arranged in a randomised block design with three replicates per treatment. Cattle urine (at 5 L m-2) was applied to grassland in mid-March and in early September 2012. A control treatment was included where no urine was applied. In separate treatments, two commercially available nitrification inhibitors were tested; dicyandiamide (DCD) and an additive containing two pyrazole derivatives (1H-1,2,4-triazole and 3-methylpyrazole) were pre-mixed with the urine prior to application to give application rates of 15 kg/ha and 5 L/ha for the DCD and the pyrazole derivatives, respectively. The urine was collected from lactating dairy cows at Reading University, kept refrigerated at <4°C and applied within two days of collection. Following urine application to five 0.36 m2 areas of the plot, measurements of direct nitrous oxide (N2O) emissions were made over c.12 months, using 5 static chambers each 0.4 x 0.4 m (1 per 0.36 m2 area, giving a total measured surface area of 0.8 m2) and analysed by gas chromatography. In a separate area of the plot, ammonia (NH3) emissions were measured for 7 days after each urine application, using a wind tunnel technique (one per plot). Nitrate (NO3) leaching losses were measured following the September urine application using porous ceramic cups (6 per plot) installed to a depth of 90 cm during the period of over-winter drainage (Webster et al., 1993) with samples collected every 50 mm of drainage or every 2 weeks whichever occurred sooner. Drainage volumes were estimated using IRRIGUIDE (Bailey and Spackman, 1986) and were combined with NO3 concentrations to quantify the amounts of NO3-N leached. Grass yields and N offtakes were also measured following grass cuts in May and July 2012 for the March urine application, and in May 2013 for the September urine application. References: Bailey, R.J. and Spackman, E. (1996). A model for estimating soil moisture changes as an aid to irrigation scheduling and crop water-use studies: I. Operational details and description. Soil Use and Management 12, 122-129. Webster, C.P., Shepherd, M.A. Goulding, K.W.T. and Lord E.I. (1993). Comparisons of methods for measuring the leaching of mineral nitrogen from arable land. Journal of Soil Science, 44, 49-62. 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, 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, cumulative ammonia emission, cumulative nitrate leaching loss, crop yield, crop total nitrogen offtake, urine dry matter, urine pH, urine total nitrogen content, urine ammonium-N content, urine nitrate-N content, urine urea-N content, urine allantoin content, urine creatinine content, urine uric acid content & urine hippuric acid content. ND = not determined. NA = not applicable. Pyrazole derivative = an additive containing two pyrazole derivatives (1H-1,2,4-triazole and 3-methylpyrazole). 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. Note: for the autumn urine analysis, it's likely that much of the urea-N may have converted to ammonium-N prior to/during ammonium-N analysis.
Subject Keywords: Nitrous oxideUrineNitrification inhibitorsGrassland soils
Geographic Keywords: Devon
Observed Properties: AllantoinAmmonia emissionAmmonium-nitrogenApplication timingCreatinineCrop nitrogen offtakeCrop yieldCropsEmission factorExperimental blockingExperimental treatmentGrass ley ageHippuric acidNitrate leachingNitrate-nitrogenNitrogen sourceNitrous oxide mass fluxRainfallSoil clay contentSoil dry bulk densitySoil organic carbonSoil pHSoil textureTotal nitrogenUrea-nitrogenUric acidYearpH
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: Soil dry bulk density
Parameter: Soil organic carbon
Parameter: Soil pH
Parameter: Soil texture
Parameter: Total nitrogen applied
Parameter: Treatment
Parameter: Urine allantoin content
Parameter: Urine ammonium-N content
Parameter: Urine creatinine content
Parameter: Urine hippuric acid content
Parameter: Urine nitrate-N content
Parameter: Urine pH
Parameter: Urine total nitrogen content
Parameter: Urine urea-N content
Parameter: Urine uric acid content
Parameter: Year experiment started

Geographic Extent -
    Longitude (West): -4.03
    Longitude (East): -3.76
    Latitude (South): 50.72
    Latitude (North): 50.89

Phenomenon Time -  Start Date/Time: 2012-03-16 End Date/Time:  2013-10-01
Result Time: 2013-10-01
Valid Time -  Start Date/Time: 2012-03-16 End Date/Time:  2013-10-01
Feature of Interest: biosphere
Publication Date: 2017-02-03

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

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