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| Titel |
The effect of urea fertiliser formulations on gross nitrogen transformations in a permanent grassland soil. |
| VerfasserIn |
Mary Harty, Christoph Mueller, Ronnie Laughlin, Catherine Watson, Karl Richards, Gary Lanigan, Patrick Forrestal, Karen McGeough |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250112254
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| Publikation (Nr.) |
 EGU/EGU2015-12405.pdf |
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| Zusammenfassung |
| Introduction
By 2050, the current food production rate will need to increase by 70 % in
order to meet the needs of the projected world population (FAO, 2014). Under the
climate change response bill, Ireland has a target to reduce GHG emissions by
20% by 2020. Agriculture was responsible for almost one third of Ireland’s overall
Greenhouse Gas (GHG) emissions in 2012, with 39% of these emissions arising
from chemical/organic fertilisers in the form of nitrous oxide (N2O). N2O losses
represent environmental damage through ozone depletion and global warming as
well as acidification, eutrophication, surface and groundwater contamination and it
also represents financial loss to the farmer (Cameron 2013). The contradictory
aims of increasing food production while reducing GHG emissions will require an
adjustment to the current system of agricultural production. As part of a larger study
evaluating the switching of nitrogen (N) fertiliser formulation to minimise N2O
emissions, (from calcium ammonium nitrate (CAN) to urea based formulations), this
experiment examined the effect of urea based fertiliser formulations on gross N
transformations in a permanent pasture soil at Hillsborough, Co. Down, Northern
Ireland.
Study Design/Methodology
A laboratory incubation study was undertaken, to examine the effect of urea in various
combinations with two types of inhibitors on soil N dynamics and N2O and N2 emissions.
The inhibitors examined were the urease inhibitor N-(butyl) thiophosphoric triamide
(nBTPT) and the nitrification inhibitor dicyandiamide (DCD). The fertiliser products were
labelled with 15N and the soil was incubated at 15 Ë C at a water filled pore space of 65%.
Soil mineral N (urea, NH4+, NO2- and NO3-) concentrations, gaseous losses
(N2O and N2) and the 15N enrichments of NH4+, NO2-, NO3-, N2O and N2were
analysed on 8 separate occasions over 25 days. An adapted numerical 15N tracing
model (Müller et al., 2007) was used to quantify the effect of the inhibitors on soil
gross N transformation rates and N2O and N2 emissions and the findings will be
presented.
Reference
C. Müller, T. Rütting, J. Kattage, R.J. Laughlin & R.J. Stevens (2007). Estimation of
parameters in complex 15N tracing by Monte Carlo sampling. Soil Biology and Biochemistry
39, 715-726. |
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