Table 1 Major characteristics of the three soils used in the extraction trial.

6.07 ± 0.02^a

4.75 ± 0.22^b

4.48 ± 0.17^b

21.8 ± 3.3^a

140.7 ± 52.9^a

47.5 ± 28.4^a

2.43 ± 0.02^a

1.45 ± 0.08^a

23.2 ± 0.5^b

0.21 ± 0.00^a

0.12 ± 0.00^b

1.12 ± 0.04^c

40.7 ± 3.2^a

31.0 ± 1.8^a

90.7 ± 2.4^b

46.0 ± 2.7^a

35.1 ± 2.2^b

8.0 ± 1.9^c

13.3 ± 0.5^a

33.8 ± 0.7^b

1.3 ± 0.5^c

145 ± 6^a

90 ± 8^a

334 ± 57^b