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Texture 8 Temperature 15 : Denitrification Rate Vs. Nitrate Concentration
Rdn (kgN ha-1 d-1)
2.0
1.5
1.0
0.5
0.0
0
Rdn (kgN ha-1 d-1) = - 0.3874 + 0.01884 NO3- Conc( µgN g-1 soil)
S 0.252597
R-Sq 88.7%
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40 60 80
NO3- Conc( µgN g-1 soil)
Figure 2.32 8-15; Denitrification Rate Vs. Nitrate Concentration
2.4.9. Texture 9 (Silty Clay)
Based on temperature, texture 9 was subdivided into the following subsets: 9-4 (n=13), 9-
5 (n=22), 9-6 (n=12), 9-7 (n=37), 9-8 (n=26), 9-9 (n=8), 9-10 (n=5), 9-11 (n=3), 9-12
(n=10), 9-13 (n=25), 9-14 (n=11), 9-15 (n=19), 9-16 (n=13),9-17 (n=14), 9-18 (n=23), 9-
19 (n=6), 9-20 (n=8), 9-21 (n=4), 9-25 (n=6),9-28 (n=9), and 9-30 (n=5). While all of the
sub-sets showed an improvement in the linear correlation between the denitrification rate
and organic carbon, except for 9-20, 9-25, 9-28 and 9-30 (Figure 2.33 - Figure 2.36) none
of the subsets were significantly correlated. The only subset to show a significant
relationship between the denitrification rate and water filled porosity is 9-11.
The subsets that showed a significant correlation between the denitrification rate and pH
are 9-10, 9-11, 9-20 and 9-30 (Figure 2.37 - Figure 2.39). The subsets with a significant
correlation between the denitrification rate and nitrate concentration are; 9-11 and 9-28.
(Figure 2.40 and Figure 2.41)
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100
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