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easons for the limitation of the model. The lack of input for soil properties may account
for why the model only works for the type of soils for which it was designed. In addition
the lack of data that leads to irregular N2O patterns may possibly cause an inaccurate
estimate of denitrification rates.
The model also ignores other important parameters, primarily pH. pH is a major factor
that controls the rate of change from N20 to N2; this may possibly affect the N2/ N2O –
ratio which will eventually affect prediction of the rate of denitrification.
Figure 1.7 Measured and SimDen-modeled denitrification rates in the entire range (left)
and the lower range of values (right), (Vinther and Hansen, 2004).
1.5.6. Additional models considered
Although not discussed in much detail, the following additional models (Table 1.1) were
considered. For a variety of reasons they are not able to be used to estimate a
denitrification rate. The models that could be used were ineffective at estimating a
reasonable denitrification rate.
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