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Soil (0–20 cm) characteristic of the study site.
| Year | pH | Electrical conductivity (μS cm−1) | Organic matter (g kg−1) | Total N (g kg−1) | Exchangeable P (mg kg−1) | Exchangeable K (mg kg−1) | Exchangeable NO3−N (mg kg−1) |
|---|---|---|---|---|---|---|---|
| 2015 | 8.0 | 229 | 17.9 | 0.9 | 13.4 | 228 | 19.0 |
| 2016 | 8.3 | 120 | 13.7 | 0.8 | 13.0 | 197 | 8.4 |
