Average shoot length, leaf surface (cm2 per leaf) and stem circumference (cm) on breast height (1.3 m), and element content of the leaves (In g per kg dry weight) per tree In three vitality-classes of Dutch elm (Ulmus x hollandice) along the Bloemgracht and the Egelantlersgracht in Amsterdam. Sampling data: 12 September 1986.
(The average values are presented ± the standard deviation)
| Class | “good’ | “moderate” | “poor” |
|---|---|---|---|
| No. of trees | 7 | 19 | 17 |
| Shoot length (cm) | 23.0 ± 8.1 | 16.7 ± 5.6 | 9.0 ± 1.7 |
| Leaf area (cm2/leaf) | 37.9 ± 5.4 | 38.1 ± 11.6 | 29.5 ± 3.2 |
| Stem circumference (cm) | 176 ± 25 | 137 ± 20 | 123 ± 18 |
| N (g/kg) | 19.9 ± 3.5 | 16.7 ± 3.2 | 13.1 ± 1.8 |
| P (g/kg) | 01.7 ± 0.2 | 01.6 ± 0.2 | 01.5 ± 0.2 |
| K (g/kg) | 12.0 ± 3.0 | 08.3 ± 3.2 | 06.6 ± 2.1 |
| Mg (g/kg) | 02.6 ± 0.3 | 03.1 ± 0.7 | 03.1 ± 0.6 |
| Ca (g/kg) | 24.4 ± 2.1 | 26.7 ± 2.7 | 23.9 ± 3.0 |
| Cl(g/kg) | 10.4 ± 1.2 | 10.2 ± 1.4 | 10.0 ± 1.3 |