Table 2.

Critical values of the chloride content in the leaves for the estimation of the occurence of salt damage for some common deciduous trees.

Tree species	Cl-content (g Cl/kg dry matter)
Tree species	Healthy	Threshold ^(*)	Visual damage
Acer pseudoplatanus	0-6	6-12	12-35
Aesculus hippocastanum	0-7	7-11	11-32
Fagus sylvatica	0-5	5-7	7-32
Fraxinus excelsior	0-4	4-10	10-30
Platanus x aceritolia	0-11	11-16	16-42
Poputus x euramericana ^(**)	0-7	7-13	13-39
Quercus robur	0-5	5-6	6-12
Salix alba	0-5	5-6	6-12
Tilia x vulgaris	0-6	6-9	9-28
Ulmus x hollandica ^(**)	0-7	7-15	15-35

↵(*) Between these levels visual symptoms may or may not appear, depending on climatic factors and the time in the growing season.
↵(**) All cultivars