Environmentally damaging emissions of N arise from agriculture: ammonia, nitrous oxide and nitrate. Losses can be altered by changed management practices; such practices also affect the interaction between the three loss pathways. There is a need to make farmers aware of the size of the N losses and the effects of management practices. This is particularly pertinent to organic farmers, where N can be limiting to some crop production. Consequently a tool to identify the fate of N (and PK) from manure could assist in developing more environmentally friendly practices that also increase crop productivity and soil fertility. Phosphorus loss from agriculture is another environmental issue that needs addressing.
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