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Properties of the top soil layer (0–30 cm) in the experimental field in 2014 and 2015.
| Year | Soil texture | pH | Organic matter (g kg−1) | Total N (g kg−1) | Alkali hydrolysable N (mg kg−1) | Olsen-P (mg kg−1) | Exchangeable K (mg kg−1) |
|---|---|---|---|---|---|---|---|
| 2014 | medium loam | 5.1 | 37.6 | 2.2 | 130.0 | 12.2 | 119.5 |
| 2015 | medium loam | 5.2 | 28.9 | 1.9 | 135.5 | 19.8 | 105.7 |
