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The effect of FYM storage conditions and land application practices on N2O emissions - CC0246

Approximately 50% of the animal manure collected in the UK is in a solid form and is stored for various periods of time before spreading onto the land. During storage there are various gaseous losses of N e.g., ammonia (NH3) volatilisation and nitrous oxide (N2O) emission. Project WA0716 was set up to determine the effect of store management in reducing NH3 emissions from FYM. As has been observed in other studies (e.g., WA0637), the abatement of one form of N, e.g. NH3, can often lead to an increase in the loss of another form of N, e.g. N2O. Therefore, one of the objectives of this study is to quantify N2O emissions from FYM heaps managed to minimise NH3 emissions and relate these emissions to fluxes of NH3. Another abatement practice being investigated in project WA0716 is the effect of incorporation technique on NH3 emissions following landspreading of the stored FYM. Incorporation of FYM into the soil should reduce NH3 emissions by enhancing the contact of any free ammonium with soil particles. However, in doing so, incorporation increases the quantity of ammonium remaining in the soil following application. Any excess N in the soil may be emitted as N2O following nitrification (and denitrification). The other main objective of this study is to determine the effect of incorporation on N2O emissions. In this way a more complete environmental assessment of managing solid manures to minimise NH3 emissions can be made. MAFF supports policies for reducing both NH3 and N2O emissions and for encouraging efficient utilisation of manures. There are few studies which provide information on the interactions between these aims. Project NT2007 will focus on nitrate leaching and fertiliser replacement values of the applied manures. This proposal seeks to ‘bolt-on’ to project WA0716 and provide added value to the existing project.
1. To quantify and compare N2O emissions from conventionally stored and sheeted FYM heaps.
2. To quantify the effect of incorporation on FYM emissions.
3. To quantify and compare N2O emissions from fresh and stored FYM following landspreading.
4. To relate N2O emissions to measurements of NH3 volatilisation, nitrate leaching and N uptake made in projects WA0716 and NT2007.
Project Documents
• Final Report : The Effect of FYM Storage Conditions and Land Application Practices on N2O Emissions   (737k)
• Final Report - Annex : The Effect of FYM Storage Conditions and Land Application Practices on N2O Emissions   (362k)
Time-Scale and Cost
From: 2000

To: 2004

Cost: £221,271
Contractor / Funded Organisations
Institute of Grassland and Environment Research (IGER)
Climate and Weather              
Climate Change              
Environmental Protection              
Greenhouse Effect              
Sustainable Production              
Fields of Study
Agriculture and Climate Change