| Soil traits | Unit | 2013 | 2014 |
| Soil depth | cm | 0 - 30 | 0 - 30 |
| EC | dS・m−1 | 0.68 | 0.62 |
| pH | - | 7.8 | 7.6 |
| Organic matter | % | 1.5 | 1.4 |
| N | % | 0.12 | 0.10 |
| P | ppm | 8 | 9 |
| K | ppm | 140 | 165 |
| Mg | mg/kg | 704 | 680 |
| Fe | mg/kg | 33.7 | 29 |
| Mn | mg/kg | 8.3 | 7.6 |
| Zn | mg/kg | 1.2 | 1.4 |
| Cu | mg/kg | 3.9 | 3.5 |
| Soil texture | - | Clay | Loam clay |