Table 2. Climatic and edaphic characteristics of study sites.
| Study sites | Areaa | Climate | Soil | |||||
| T (°C) | P (mm) | pH | SOM (%) | N (%) | CaCO3 (%) | Gypsum (%) | ||
| Villamayor (Z) | Z | 14.2 | 370 | 7.7 | 1.9 | 0.14 | 20.0 | 55.5 |
| Peñaflor (Z) | Z | 14.2 | 370 | 8.00 | 0.88 | 0.051 | 13.04 | 66.30 |
| Alcalá de Henares (M) | M | 13.2 | 350 | 7.8 | 1.8 | 0.15 | 20.6 | 32.0 |
| Chinchón (M) | M | 13.8 | 422 | 7.7 | 2.1 | 0.12 | 9.7 | 59.3 |
| Tendilla (Cu) | M | 13.0 | 410 | 7.8 | 2.4 | 0.17 | 22.3 | 29.3 |
Abbreviations: T = Mean annual temperature; P = total annual rainfall; SOM = soil organic matter; N = nitrogen.
a
M = Madrid (Central Spain, Middle Tajo Basin), Z = Zaragoza (NE Spain, Middle Ebro Basin).