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| year | pH | organic matter (g kg–1) | total N (g kg–1) | NO3−−N (mg kg–1) | NH4+–N (mg kg–1) | available P (mg kg–1) | available K (mg kg–1) |
|---|---|---|---|---|---|---|---|
| 2016 | 7.3 | 12.1 | 1.2 | 15.8 | 8.2 | 24.3 | 90.6 |
| 2017 | 7.2 | 13.0 | 1.3 | 17.0 | 10.9 | 23.7 | 101.8 |
| 2018 | 7.1 | 13.5 | 1.3 | 15.4 | 12.3 | 19.7 | 113.5 |
