TABLE 1.
Physicochemical properties of soils associated with different aged, healthy and diseased American ginseng (AG) plants.
| H2 | D2 | H3 | D3 | H4 | D4 | |
| AP (mg/kg) | 81.52 ± 3.99a | 85.10 ± 12.40a | 47.88 ± 6.83cd | 64.35 ± 7.57b | 52.18 ± 4.29bc | 35.00 ± 6.12d |
| AK (mg/kg) | 567.00 ± 8.98a | 361.5.33 ± 19.71b | 161.67 ± 1.25d | 296.67 ± 1.25b | 225.00 ± 13.59c | 352.00 ± 17.68b |
| KMnO4-C (mg/g) | 4.06 ± 0.385ab | 3.68 ± 0.80b | 3.23 ± 0.43b | 2.32 ± 0.35c | 4.13 ± 0.38ab | 3.84 ± 0.62a |
| EC (μS/cm) | 317.33 ± 7.50a | 176.17 ± 10.91c | 55.27 ± 6.76e | 82.93 ± 2.83d | 223 ± 26.15b | 61.17 ± 5.60de |
| pH | 6.43 ± 0.02a | 5.79 ± 0.04d | 5.94 ± 0.09c | 5.77 ± 0.01d | 5.76 ± 0.02d | 5.49 ± 0.02e |
| C/N | 12.56 ± 0.80a | 11.68 ± 0.57ab | 10.84 ± 0.44b | 10.33 ± 0.72b | 12.70 ± 0.69a | 12.47 ± 0.54a |
| N/P | 0.53 ± 0.02ab | 0.56 ± 0.22a | 0.48 ± 0.05c | 0.50 ± 0.016bc | 0.43 ± 0.004d | 0.39 ± 0.026d |
The data represent the mean ± standard deviation (n = 4), different small letters indicate a significant (P < 0.05) difference in the measured soil property between the different soil samples as determined by a Tukey’s multiple comparison test. H2, soils obtained from 2-year-old healthy AG plants; D2, soils obtained from 2-year-old diseased AG plants; H3, soils obtained from 3-year-old healthy AG plants; D3, soils obtained from 3-year-old diseased AG plants; H4, soils obtained from 4-year-old healthy AG plants; D4, soils obtained from 4-year-old diseased AG plants; AP, available phosphorus; AK, available potassium; KMnO4-C, KMnO4-oxidizable carbon; EC, electrical conductivity; C/N, the ratio of soil organic matter to soil total nitrogen; N/P, the ratio of soil total nitrogen to soil total phosphorus.