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Soil nutrient properties of the experimental field.
| Year | pH | Organic matter (g/kg) | Nitrate nitrogen (mg/kg) | Ammonium nitrogen (mg/kg) | Available phosphorus (mg/kg) | Available potassium (g/kg) |
|---|---|---|---|---|---|---|
| 2019 | 7.75 | 10.40 | 25.80 | 17.90 | 21.90 | 69.90 |
| 2020 | 8.07 | 10.70 | 33.70 | 13.10 | 23.50 | 51.40 |
