Agriculture Reference
In-Depth Information
140
120
100
80
60
40
pooled regression: y = 1.044 x + 23.6
root mean square error (RMSE) = 3.5 mm
20
0
0
20
40
60
80
100
mean weight diameter (MWD) from sieve analysis in mm
Fig. 7.9
Sensing of soil tilth by the standard deviation of the forces acting on a sensing tine (From
Bogrekci and Godwin
2007b
, altered)
120
r
2
= 0.89
y = 1.01 x - 3.22
root mean square error (RMSE) = 6.3 mm
100
80
60
40
20
0
0
20
40
60
80
100
120
sieve-derived mean weight diameter (MWD) in mm
Fig. 7.10
Soil tilth recorded either by the standard sieving method or by the tine sensor (From
Bogrekci and Godwin
2007b
, altered)
from the data in Fig.
7.9
. The root mean square error of recording the soil break-up
via the tine sensor instead of the standard sieving method is 6.3 mm of the mean
weight diameter. Taking into account the reactions of the crops on the mean weight
diameter (Fig.
7.6
), this error seems acceptable.
