Correlation of root attributesz with trunk angle and rest angle following winching seven months after planting 57 L containers into landscape.
| Root attribute | Pearson correlation coefficient (P value) | |
|---|---|---|
| Trunk angle while holding at 4.1 MN/m2 | Trunk rest angle immediately following winching to 4.1 MN/m2 | |
| 3.8 L visual imprint ratingy | 0.32 (0.05) | (>0.05) |
| No. radiating straight roots trunk to 5 cm beyond 57 L container wall positionx | −0.34 (0.03) | −0.33 (0.04) |
| Percent graded as cullw | 0.38 (0.02) | 0.34 (0.04) |
| Root symmetry ratingv | −0.39 (0.01) | −0.33 (0.04) |
| Percent circumference without roots >5 mm diameter 5 cm beyond 57 L container wall position | 0.39 (0.01) | (>0.05) |
| Total no. roots >3 mm diameter grew into landscape from top half of 57 L container root ball | −0.33 (0.04) | −0.38 (0.02) |
| Root CSA (mm2) top halfu | −0.33 (0.04) | −0.38 (0.02) |
↵z Roots within a 60 cm diameter 60 cm deep cone shaped soil volume centered on the trunk.
↵y Visual rating of root deflection severity at indicated container position with 1 = little imprint or retained “cage” formed by deflected roots, and 5 = strong imprint formed by deflected roots retaining the shape of the container).
↵x Number of roots >3 mm diameter measured 5 cm outside the position of the 57 L container wall that grew from trunk at < 45 degree angle to substrate surface without making a turn of >60 degrees relative to parent root azimuth at trunk.
↵w Graded cull according to Anonymous (2015).
↵v Visual rating with 1 = radially asymmetrical distribution of roots with most on one side of root ball, and 5 = radially symmetrical distribution of mother roots (roots growing directly from stem).
↵u Root cross-sectional area (CSA) measured 5 cm outside 57 L root ball position for roots >3 mm diameter growing from top half of root ball.