But if it gets heavy use you will flatten and compact the soil in a ring around the tree, which is not good for it.
Times, Sunday Times (2009)
Do not compact the soil too much.
Bloom, Adrian Winter Garden Glory (1993)
An experimental study was conducted on the compacted soil using a modified temperature-controlled oedometer.
Mehrdad Kholghifard, Kamarudin Ahmad, Nazri Ali, Roohollah Kalatehjari, Farzad Babakanpour 2014, 'Temperature effect on compression and collapsibility of residual granitic soil', Građevinar