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Northern regions.
Graphic display of the RSN and N loss values at
Canada Ecoregion provided quantitative
visualization of which Ecoregions the RSN and N
lost levels were high and we concluded that high N
input resulted in high RSN, and high N lost was
driven by both high N input and high precipitation
and drainage in a given ecoregion. The increased
RSN values were mainly due to the continuous
increase of N input from fertilizer, manure and
biological N fixation compared to moderate
increases in N uptake by crop yields. Farm
management response options should be established
to reduce nitrate N leaching in higher risk regions,
such as reducing livestock numbers, matching
fertilizer N to crop requirements etc.
The principle of the CANB v4.0 program can be
applicable to other regional scales, such as
watershed, forestry, urban areas or other countries
for estimating the amount of surplus N entering into
ecosystem, environment or human food chain.
ACKNOWLEDGEMENTS
We appreciate the funding support provided by
Agriculture and Agri-Food Canada.
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