Geoscience Reference
In-Depth Information
12
Kd = exp(0.0336 EC
a
)
1:1
SS = 411
Kd = 0.171 SOC
SS = 237
10
8
6
4
2
0
0
2
4
6
8
10
12
K
d
Measured (L kg
-1
)
fIGURe 14.3
Measured atrazine K
d
versus K
d
predicted from apparent electrical conductivity, EC
a
, or soil
organic carbon fraction, SOC.
250
9.5
7.5
5.5
3.5
1.5
0
0
250
250
0
0
250
Easting (m)
fIGURe 14.4
Spatial distribution of atrazine K
d
values predicted from (a) apparent electrical conductivity,
EC
a
, and (b) soil organic carbon fraction, SOC.
direct measurement of K
d
, estimating K
d
from EC
a
measurements is nearly as accurate as the com-
monly used method of estimating K
d
from SOC with the major advantage that using EC
a
to map K
d
is a rapid, easy, and inexpensive method once it has been calibrated.
