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R_d_n (kgN ha-1 d-1)
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Texture 4 Temperature 25: Denitrification Rate Vs. Nitrate Concentration
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R_d_n (kgN ha-1 d-1) = - 0.478 + 0.1439 NO3- Conc( µgN g-1 soil)
S 2.21243
R-Sq 74.0%
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NO3- Conc( µgN g-1 soil)
Figure 2.20 4-25; Denitrification Rate Vs. Nitrate Concentration
2.4.5. Texture 5 (Sand)
Based on temperature the sandy texture could be broken down into 5-2 (n=3), 5-5 (n=3),
5-10 (n=7), 5-15 (n=40), 5-20 (n=13), 5-22 (n=7) and 5-25 (n=30). The majority of the
subsets have the same or only two distinct pH, organic carbon and nitrate concentration
values. For the subsets which have at least a minimum of three distinct organic carbon
values, the linear correlation between organic carbon and the denitrification rate was
weak. The relationship was in some cases weaker that the previous section, this is also
true for the relationship between Rdn and pH, as well as Rdn and Nitrate Concentration.
The only relationship that showed an improvement was Rdn Vs. WFP, the significant
improvement of the linear relationships was shown only 5-2 and 5-22 (Figure 2.21 and
Figure 2.22).
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