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developed based on a common set of conditions such as Texture, Temperature or WFP<br />

and then applied to the exact same set of conditions on which they were developed. This<br />

method with some refinements may prove to be practical method in estimating a<br />

denitrification rate. This method is discussed in further detail in Chapter 2.<br />

Predicted<br />

50<br />

40<br />

30<br />

20<br />

10<br />

0<br />

0<br />

Anderson (1998) - Denitrification Rate : Predicted Vs.Target<br />

10<br />

20<br />

Actual<br />

Figure 1.6 Anderson (1998), Predicted denitrification rates based on Equation 1.11.<br />

1.5.5. SimDen<br />

SimDen is a simple empirical model created by the Danish Institute of Agricultural<br />

Sciences to answer the primary question, how much Nitrogen is lost due to<br />

denitrification? SimDen is based on a combination of average results from the literature,<br />

several years of experience and a portion of common sense (Vinther, 2005). SimDen is<br />

described in further details and can be downloaded at www.agrsci.dk/simden<br />

Using SimDen, it is possible to give a rough estimate of the average annual<br />

denitrification in Danish agricultural soils (Vinther & Hansen, 2004). The model had to<br />

be modified to be adapted to Danish soils as the soils are relatively low in clay,<br />

Therefore, an extended version – SimDen-Clay – was used which gives average estimates<br />

23<br />

30<br />

40<br />

50

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