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The subset Texture 1-Temperature 20 ºC comprises a total of 13 distinct records of data.
The only improvement was in the denitrification rate – pH relationship (Figure 2.8).
R_d_n (kgN ha-1 d-1)
60
50
40
30
20
10
0
7.2
7.4
7.6
2.4.2. Texture 2 (Clay Loam)
Texture 1 Temperature 20 : Denitrification rate Vs. pH
R_d_n (kgN ha-1 d-1) = 243.5 - 27.90 pH
7.8
pH
43
8.0
S 8.90490
R-Sq 70.6%
Figure 2.8 1-20; Denitrification rate Vs. pH
This subset has four unique temperatures 10ºC, 20ºC, 22ºC and 25ºC. The dataset with a
temperature of 10ºC has only three data points. A plot of Rdn- OC and Rdn-pH yields a
good linear correlation for the plot (Figure 2.9 and Figure 2.10). The WFP for all three
values was the same and there are only two distinct nitrate concentration values.
Subset Temperature 20 has 47 records of data. This subdivision did not yield any
significant improvements in linear relationships.
Subset Temperature 22 has seven distinct records of data. This subset yields a good
correlation for Rdn Vs. WFP (Figure 2.11) while showing a decent improvement in linear
regression for all the categories.
8.2
8.4
8.6