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Author(s): IGER, Institute of Grassland & Environmental Research
Publication Date: January 1, 1995
Reference: Research to Prevent Pollution. IGER, Silsoe Research Institute.
Country: United Kingdom

Summary:

The microbial processes occurring in the soil result in atmospheric emission of N2O as a result of nitrification and denitrification. The organic matter going through the mineralisation process is transformed to ammonium-N (NH4-N) which is than transformed by nitrification to nitrate-N (NO3-N) and the denitrification transform the nitrate to nitrous oxide (N2O) and nitrogen gas (N2). Nitrous oxide is a greenhouse gas and some factors are thought to control its emission for soil transformation and they are: soil type, slurry type, rate and application season. As denitrification process requires anaerobic conditions, application in dry soil conditions would result in lower N2O emissions. Lower emissions are also observed when manure application is done during the crop growing season and when plant uptake of nitrate occurs. Larger application rates will result in greater emissions of N2O. Experiments showed that the emissions were higher in clay soils than in sandy soils following the same manure and applications. And pig manure which N content is generally than dairy manure leads to more important N2O production.

The transformation occurring in the soil to nitrogen compounds can result in N2O emissions which is a greenhouse gas. Ammonia emissions following manure application have been investigated but information is also needed on the other N compounds emission as they can impact on the environment and those N losses change the N available to the plants or the N that can leach.

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