Table 1.
Measurement methods of soil properties.
| Soil properties | Abbr. | Measuring method |
|---|---|---|
| Soil water content | SWC (g·kg−1) | Drying method |
| Soil salt content | SSC (g·kg−1) | Electrical conductivity method |
| pH | pH | Glass electrode method |
| Soil organic carbon | SOC (g·kg−1) | Potassium dichromate method |
| Soil total nitrogen | STN (g·kg−1) | Kjeldahl nitrogen method |
| Soil ammonium nitrogen | SAN (mg·kg−1) | Indophenol blue colorimetry |
| Soil nitrate nitrogen | SNN (mg·kg−1) | Dual-wavelength ultraviolet spectrophotometry |
| Soil total phosphorus | STP (g·kg−1) | Molybdenum blue colorimetric method |
| Soil available phosphorus | SAP (mg·kg−1) | Molybdenum antimony anti-colorimetric method |