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There is no subset that shows a significant correlation between the denitrification rate and
pH. Subset 9-13-100 is the only subset to show a significant linear correlation between
the denitrification rate and the nitrate concentration (Figure 2.57).
Texture 9 Temperature 13 WFP 100 : Denitrification Rate Vs Nitrate Concentration
Rdn (kgN ha-1 d-1)
0.020
0.015
0.010
0.005
0.000
1.50
Rdn (kgN ha-1 d-1) = - 0.01533 + 0.01125 NO3- Conc( µgN g-1 soil)
S 0.0072510
R-Sq 68.1%
1.75
2.00 2.25
NO3- Conc( µgN g-1 soil)
Figure 2.57 9-13-100; Denitrification Rate Vs. Nitrate Concentration.
2.5.10. Texture 10 (Silty Clay Loam)
The silty clay loam subset were divided into seven subsets: 10-18-100 (n=3), 10-20-52
(n=4), 10-20-100 (n=12), 10-25-60 (n=10), 10-25-75 (n=9), 10-25-90 (n=9) and 10-25-
100 (n=4). The majority of the subsets did not have more than three distinct values for
organic carbon, pH and nitrate concentration and hence no valuable information could be
obtained from any of the subsets except for the linear relationships between the
denitrification rate and the nitrate concentration for the 10-25-100 subset (Figure 2.58)
73
2.50
2.75