Reducing emissions from land associated with ruminant production
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Potentially harmful emissions from ruminant production include nitrates, ammonia (NH3), phosphorus (P) compounds, the greenhouse gases nitrous oxide and methane, organic matter and offensive odours. Although P is of increasing concern, there has been much emphasis on reducing N emissions. Methods include more careful management of fertilizer and livestock manures to increase the efficiency of N utilisation, slurry application techniques such as injection for reducing NH3 and odour emissions and the use of acid or nitrification inhibitors to conserve N for plant uptakes. Establishing cover crops, or buffer strips adjacent to watercourses, can remove excess plant nutrients from soils. Reducing losses from only one part of the production system may increase those via another pathway so it is necessary to consider the whole farming system to achieve net reductions. This may involve modifications to buildings, cropping, fertilizer and livestock waste management and animal feeding strategies.
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