Critical levels of the C-figure of the soil for the estimation of the occurence of salt damage for some common deciduous trees.
Rating of symptoms
No visual damage observed
Threshold level for the occurence of visual damage
Visual damage (leaf-necrosis, leaf-shedding, twig-dieback)
Heavy damage or initial stages of death
| Tree species | C-figure (g NaCI/l soil moisture) | |||
|---|---|---|---|---|
| I | II | III | IV | |
| Acer pseudoplatanus | 0-2 | 2-3 | 3-9 | 9-12 |
| Aesculus hippocastanum | 0-2 | 3 | >3 | … |
| Fagus sylvatica | 0-2 | 2-4 | 4-10 | >7 |
| Fraxinus excelsior | 0-3 | 3-4 | 4-11 | 7-11 |
| Platanus x acerifolia | 0-2 | 2-6 | 6-10 | 6-10 |
| Populus x euramericana (*) | 0-1 | 1-2 | 2-6 | >6 |
| Quercus robur | 0-5 | 5-10 | > 10 | … |
| Salix alba | 0-2 | 2-6 | 6-12 | 4-12 |
| Tilia x vulgaris | 0-4 | 4 | > 4 | … |
| Ulmus x hollandica (*) | 0-2 | 2-4 | 4-7 | >8 |