Sward composition and soil moisture conditions affect nitrous oxide emissions and soil nitrogen dynamics following urea-nitrogen application

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Title: Sward composition and soil moisture conditions affect nitrous oxide emissions and soil nitrogen dynamics following urea-nitrogen application
Authors: Bracken, ConorLanigan, GaryRichards, KarlMüller, CristophTracy, SaoirseGrant, JimKrol, D. J.Sheridan, HelenLynch, BridgetGrace, C.Fritch, RochelleMurphy, Paul
Permanent link: http://hdl.handle.net/10197/12426
Date: 20-Jun-2020
Online since: 2021-08-19T16:08:07Z
Abstract: Increased emissions of N2O, a potent greenhouse gas (GHG), from agricultural soils is a major concern for the sustainability of grassland agriculture. Emissions of N2O are closely associated with the rates and forms of N fertilisers applied as well as prevailing weather and soil conditions. Evidence suggests that multispecies swards require less fertiliser N input, and may cycle N differently, thus reducing N loss to the environment. This study used a restricted simplex-centroid experimental design to investigate N2O emissions and soil N cycling following application of urea-N (40 kg N ha−1) to eight experimental swards (7.8 m2) with differing proportions of three plant functional groups (grass, legume, herb) represented by perennial ryegrass (PRG, Lolium perenne), white clover (WC, Trifolium repens) and ribwort plantain (PLAN, Plantago lanceolata), respectively. Swards were maintained under two contrasting soil moisture conditions to examine the balance between nitrification and denitrification. Two N2O peaks coincided with fertiliser application and heavy rainfall events; 13.4 and 17.7 g N2O-N ha−1 day−1 (ambient soil moisture) and 39.8 and 86.9 g N2O-N ha−1 day−1 (wet soil moisture). Overall, cumulative N2O emissions post-fertiliser application were higher under wet soil conditions. Increasing legume (WC) proportions from 0% to 60% in multispecies swards resulted in model predicted N2O emissions increasing from 22.3 to 96.2 g N2O-N ha−1 (ambient soil conditions) and from 59.0 to 219.3 g N2O-N ha−1 (wet soil conditions), after a uniform N application rate. Soil N dynamics support denitrification as the dominant source of N2O especially under wet soil conditions. Significant interactions of PRG or WC with PLAN on soil mineral N concentrations indicated that multispecies swards containing PLAN potentially inhibit nitrification and could be a useful mitigation strategy for N loss to the environment from grassland agriculture.
Funding Details: Department of Agriculture, Food and the Marine
Teagasc
University College Dublin
Type of material: Journal Article
Publisher: Elsevier
Journal: Science of the Total Environment
Volume: 722
Copyright (published version): 2020 Elsevier
Keywords: Nitrous oxideSoil nitrogen cyclingMultispecies swardsPerennial ryegrass (Lolium perenne)White clover (Trifolium repens)Ribwort plantain (Plantago lanceolata)Plant-species diversityNitrate leaching lossesN2O emissionsGrassland soilN fertilizerNitrificiation inhibitorSampling frequencyCattle slurryOrganic NTransformation
DOI: 10.1016/j.scitotenv.2020.137780
Language: en
Status of Item: Peer reviewed
ISSN: 0048-9697
This item is made available under a Creative Commons License: https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Appears in Collections:Biology & Environmental Science Research Collection
Earth Institute Research Collection
Agriculture and Food Science Research Collection

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