Trunk and root cross-sectional areaz for trees planted into soil six years earlier from four nursery container volumes.
| Container volume at planting (L) | Trunk cross-sectional area (cm2) | Root cross-sectional area in landscape (cm2) | Trunk CSA: root CSAz | Percent of five largest roots not deflected (%)y |
|---|---|---|---|---|
| 11 | 155 ax | 114 b | 1.7 a | 94 c |
| 103 | 267 b | 96 b | 4.2 a | 53 b |
| 230 | 321 c | 32 a | 11.3 ab | 12 a |
| 983 | 459 d | 39 a | 18.4 b | 0 a |
↵zTrunk CSA measured 30 cm above soil; total CSA of the five largest roots in north and south quadrants (10 total) measured 15 cm outside original planted root ball periphery; trunk CSA: root CSA ratio calculated as a mean for each tree.
↵yPercent of the five largest roots measured close to the trunk in the top 10 cm of the planted root ball that grew into landscape soil without deflection.
↵xMeans in a column with a different letter are statistically different at P < 0.05 and were compared with Duncan’s MRT (n = 16, averaged across irrigation and mulch treatments).