Table 1.

Effect of mechanical root disruption treatments 14 months after planting on root regeneration of the sides and bottoms of pot-bound, container-grown treesz.

Mean no. of rootsMean no. of rootsMean no. of rootsMean no. of roots
(<5 mm [0.20 in] diameter)(5.1 to 10 mm [0.20 to 0.40 in] diameter)(10.1 to 30 mm [0.40 to 1.20 in] diameter)(>30.1 mm [1.20 in] diameter)
TreatmentSideBottomSideBottomSideBottomSideBottom
Tilia cordata
    Score236.1 ±87.4  79.6 ± 63.0  7.6 ± 7.14.6 ± 5.71.1 ± 1.50.3 ± 0.80.1 ± 0.40.0 ± 0.0
    Butterfly147.0 ±70.1  69.7 ± 27.1  9.0 ±6.75.0 ±3.01.4 ±2.00.6 ± 0.80.0 ± 0.00.0 ± 0.0
    Tease202.3 ± 87.4  72.0 ± 44.1  7.0 ±6.63.4 ± 2.91.4 ±2.20.4 ±0.80.0 ± 0.00.0 ± 0.0
    Control230.2 ± 28.3  95.6 ± 42.810.6 ±0.95.9 ± 4.31.3 ± 1.50.0 ± 0.00.0 ± 0.00.0 ± 0.0
Salix alba ‘Niobe’
    Score165.4 ±81.7  59.7 ± 64.015.1 ±0.27.3 ± 6.917.1 ±7.52.6 ± 1.83.3 ± 3.61.9 ± 2.9
    Butterfly169.1 ±33.9  73.4 ± 72.512.4 ±5.46.3 ± 2.414.4 ± 8.44.1 ± 3.44.0 ± 2.00.3 ± 0.8
    Tease208.1 ± 89.9111.1 ±6.016.7 ±0.48.6 ± 3.615.6 ± 8.15.7 ± 5.13.1 ± 3.00.1 ± 0.4
    Control230.1 ± 14.3111.8 ±3.715.1 ± 1.09.0 ±5.113.0 ±5.05.8 ± 3.63.4 ±3.10.8 ± 2.3
  • zEach value is the mean and standard deviation of seven observations for each treatment within species and nine observations for the controls within species. The treatment descriptions are given in the materials and methods section. There were no significant differences between treatments using Fisher’s least significant difference at the 5% level (P = 0.05).