Article Figures & Data
Figures
- Figure 1.
The basic growing containers used for producing the study trees were 26 L (7 gal) as shown in A. One-fourth of the trees were propagated in extension casing containers (B). Trees were then removed from containers and planted with extension casings remaining to act as barriers (C). Remaining trees were removed from standard 26-L containers and planted in surround-style applications of Tree Root Planter (D) and DeepRoot (E) commercial root barriers. Control trees were planted without barriers or extension casings
- Figure 2.
Mean depth of the 6 largest roots growing at 2 distances (33 and 66 cm) from the tree boles was measured. At 33 cm from the tree (4 cm outside of the barriers), mean root depth was at or just below the bottoms of the barriers and casings. At 66 cm (37 cm from the barriers), roots for all treatments were ascending toward control root depth.
- Figure 3.
Percentages of the total means of dry weight for each of 3 root diameter classes. Only the casing treatment produced roots with significantly smaller diameters than the control
Tables
- Table 1.
Results for all possible pairwise comparisons (Tukey) between all treatment means and for all treatments against the control (Dunnett) were the same, showing significant differences in dry weights and diameter for the extension casing treatment only. Depths of roots from ground surface were measured at 2 distances (33 and 66 cm) from the tree bole center. Compared to control, barrier and extension casing treatment roots were growing at a deeper level.
Treatment Root dry weight inside barrier (kg) Root dry weight outside barrier (kg) Root diameter outside barrier (cm) Root depth at 33-cm radius (cm) Root depth at 66-cm radius (cm) Control 0.308 a* 0.684 a 1.87 a 18.54 a 18.82 a DeepRoot 0.389 a 0.616 a 1.61 a 27.15 b 23.74 b Tree Root Planter 0.376 a 0.633 a 1.69 a 28.74 b 23.25 b Extension cabling 0.067 b 0.345 b 1.04 b 24.46 b 22.39 b Standard error 0.047 0.065 0.121 0.796 1.012 ↵* Treatments followed by the same letter are not significant at α = 0.05.
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