Any soil volume guide can only be that; a guide. Differing clones of the same tree species can have different rooting requirements, and water draw can be widely altered by something as simple as a windier planting location, as wind speeds radically change evapo-transpiration rates from the tree.
This new guide is the first ever in the world to bring together these soil volume studies with the extensive knowledge that we have relating to tree species. Now, a quick reference will show the recommended volume for the species under consideration, and a useful explanation of the likely tree pit cost, and lifespan of the tree given the volumes available.
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