| Planting year | pH value (2003) | pH value (2004) | pH value (2005) | pH value (2006) | pH value (2007) | pH value (2008) | pH value (2009) | pH value (2010) | pH value (2011) |
| 2000 (S. Clay. S) | 4.92 | 6.08 | 5.90 | 5.80 | 5.60 | 5.90 | 5.90 | 6.10 | 6.15 |
| 2002 (Sandy. S) | 4.23 | 5.34 | 5.45 | 5.40 | 5.50 | 5.56 | 5.40 | 5.70 | 5.80 |
| 2005 (Peat. S) | 3.73 | 4.00 | 4.30 | 4.50 | 4.70 | 4.70 | 4.80 | 4.90 | 4.80 |
| 2006 (Peat. S) | 4.38 | 4.50 | 4.70 | 4.60 | 4.80 | 4.90 | 4.87 | 4.90 | 4.85 |
| 2006 (Aluvir. S) | 4.22 | 5.32 | 5.47 | 5.50 | 5.45 | 5.50 | 5.44 | 5.60 | 5.70 |