Research Article
Effects of Soil Properties on Pb, Cd, and Cu Contents in Tobacco Leaves of Longyan, China, and Their Prediction Models
Table 1
Physical and chemical properties of soils in tobacco-grown areas.
| | Item | Sample number | Min | Max | Average | Standard deviation | Coefficient of variation (%) |
| | pH | 421 | 3.37 | 8.64 | 5.81 | 0.471 | 8.1 | | Organic matter (g/kg) | 421 | 6.70 | 205 | 29.1 | 15.9 | 54.6 | | Alkali-hydrolyzable nitrogen (mg/kg) | 421 | 25.0 | 211 | 99.5 | 24.8 | 25.1 | | Available phosphorus (mg/kg) | 421 | 5.07 | 159 | 37.4 | 16.5 | 44.2 | | Available potassium (mg/kg) | 421 | 1.35 | 251 | 26.1 | 20.6 | 79.1 | | EC (mS/cm) | 421 | 0.153 | 1.32 | 0.587 | 0.166 | 28.3 | | TOC (g/kg) | 421 | 7.98 | 210 | 31.5 | 12.9 | 40.9 |
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