Table 2.
Soil mineral composition (mg/kg, dry weight basis) of nonorganic and organic management farms located at the coastal and metropolitan regions.
| Coastal Region | Metropolitan Region | |||
|---|---|---|---|---|
| Nonorganic | Organic | Nonorganic | Organic | |
| Ca | 938.6 ± 1.8 | 131.8 ± 55.6 * | 941.5 ± 42.4 | 1322 ± 223 |
| Cu | 9.4 ± 0.07 | traces * | 8.75 ± 0.3 | 0.69 ± 0.47 * |
| Fe | 18,356 ± 725 | 1228 ± 239 * | 3625 ± 80 | 24,351 ± 2104 * |
| K | 2062 ± 57 | traces * | 184.4 ± 14.3 | 1306 ± 150 * |
| Mg | 3171 ± 45 | traces * | 61.1 ± 18 | 3311 ± 361 * |
| Mn | 219.7 ± 3.7 | 11.7 ± 1.9 * | 8.82 ± 2.9 | 275.4 ± 33.9 * |
| Na | traces | traces | traces | traces |
| P | 695.9 ± 2.6 | 81.5 ± 10.5 * | 938.4 ± 20.6 | 267.3 ± 35.1 * |
| Zn | 45.6 ± 1.0 | traces * | 12.46 ± 1.2 | 34.1 ± 5.2 * |
| N | 4801.1 ± 42.7 | 1048.2 ± 24.3 * | 6087.2 ± 199.1 | 2701.8 ± 14.9 * |
Results were expressed as mean ± standard deviation (n = 3). The asterisk indicates significant difference between soil samples of nonorganic and organic management farms from the same region (unpaired t-test, p < 0.05). “Traces” means that values were below the limits of quantification and above the limits of detection of the analytical method for each mineral.