Table 2.

Concrete cracking associated with soil treatments and tree root growth. Means followed by the same letter do not differ significantly (SNK p = 0.05).

TreatmentNumber of replicatesMean number of cracks in the concrete per replicate
Compacted soil60.17 a
Expanded slate structural soil60.83 a
Supported concrete61.00 a
Gravel-based structural soil62.83 b