ekS - Instytut Agrofizyki im. Bohdana DobrzaÅskiego PAN w Lublinie ...
ekS - Instytut Agrofizyki im. Bohdana DobrzaÅskiego PAN w Lublinie ...
ekS - Instytut Agrofizyki im. Bohdana DobrzaÅskiego PAN w Lublinie ...
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efractive index of water, n w = 8.676, and soil solid state, n s = 2.177, were found.<br />
Introducing these values into (67), we have:<br />
referred to as the model IV.<br />
n = 2.177<br />
+ 7.676θ −1.<br />
177φ<br />
(74)<br />
IV<br />
A B n<br />
n I = 0,923n + 0,289<br />
II = 0,979n + 0,078<br />
8<br />
R 2 8 R 2 = 0,979, S<br />
= 0,923, S yx = 0,408<br />
yx = 0,22<br />
6<br />
6<br />
n I<br />
4<br />
n II<br />
4<br />
2<br />
0<br />
1 : 1 line<br />
trend line<br />
0 2 4 6 8<br />
n<br />
2<br />
0<br />
1 : 1 line<br />
trend line<br />
0 2 4 6 8<br />
n<br />
C n III = 0,982 n + 0,068<br />
D n IV = 0,903 n + 0,408<br />
8<br />
R 2 = 0,982, S yx = 0,21<br />
8<br />
R 2 = 0,961, S yx = 0,28<br />
6<br />
6<br />
n III<br />
4<br />
n IV<br />
4<br />
2<br />
0<br />
1 : 1 line<br />
trend line<br />
0 2 4 6 8<br />
n<br />
2<br />
0<br />
1 : 1 line<br />
trend line<br />
0 2 4 6 8<br />
n<br />
Fig. 29.<br />
Comparison of model values of the EM refractive index of the soil with the use of A −<br />
model I, B − model II, C − model III and D − model IV, with the values measured with<br />
TDR device (horizontal axis)<br />
The water refractive index, n w , in the temperature 20° C, in the frequency<br />
1 GHz, is 8.95 (CRC [17]). The difference between the table and calculated<br />
exper<strong>im</strong>ental values of n w suggests that its value decreases for water the soil. The<br />
76