Treatment group 1 | 2 trees pulled first to primary anchorage failure and then to ultimate failure (uprooted) | | |
Treatment group 2 | 8 trees pulled to primary anchorage failure and left standing with a lean | 2 trees failed in the meantime, 6 pulled non-destructively to 0.25° | 1 tree failed in the meantime, 5 pulled non-destructively to 0.25° |
Control group 1 | 10 trees first pulled non-destructively to 0.25°, then to ultimate failure (2 trees uprooted, 8 stems broke) | | |
Control group 2 | | 6 trees first pulled non-destructively to 0.25°, then pulled to ultimate failure | |
Control group 3 | | | 5 trees pulled non-destructively to 0.25° |