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2.4.7. Texture 7 (Sandy Loam)
The Sandy loam dataset can be divided based on temperature into 18 subsets. The
following temperatures within the sandy loam texture have more that 3 records of data. 2
ºC (n=6), 3 ºC (n=6), 4 ºC (n=6), 5 ºC (n=8), 7 ºC (n=5), 10 ºC (n=10), 11 ºC (n=5), 12 ºC
(n=9), 13 ºC (n=6), 14 ºC (n=6), 15 ºC (n=6), 16 ºC (n=6), 18 ºC (n=11) , 20 ºC (n=16),
22 ºC (n=3), 25 ºC (n=19), 28 ºC (n=31), and 35 ºC (n=21).
The majority of the data, once sub-divided, do not have different values for organic
carbon, and pH. There are only three subsets (7-20, 7-25 and 7-28) with three or more
unique nitrate concentration values. The linear relationship between the denitrification
rate and nitrate concentration is weak for all of the three subsets. The same applies to pH
values, except for 7-15, 7-20, 7-22, 7-25 and 7-28. Except for 7-22 there is no significant
relationship between the denitrification rate and pH. Even with organic carbon values
there are no subsets with three or more organic carbon values except for 7-5, 7-20 and 7-
28, unfortunately there is no significant linear relationship between the denitrification rate
and organic carbon.
The water filled porosity values fortunately do yield more information. With the
exception of 7-15 and 7-22 all of the subsets have three or more unique values. All of the
subsets show improvement in linear relationship between the denitrification rate and
water filled porosity. In general while there is an improvement in the coefficient of
determination the only subsets with a significant improvement are 7-4, 7-7, 7-10, 7-12, 7-
13, 7-14, 7-16 and 7-28 (Figure 2.23 - Figure 2.29)
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