Take a look at the Murray/ Darling system, answers it all.
Danny, many of our natives are sensitive to phosphorus (p).
From Seans excellent link:
TreeHelp.com: Features: Troubles in the Rhizosphere - Part 3 Quote:
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On some subtropical and tropical trees, such as the macadamia, multi-branched clusters of non-woody roots called proteoid roots form. The proteoid roots alter the rhizosphere by acidification processes that facilitate the absorption of phosphorus-containing ions. When I examined the roots of dying macadamia nut trees in an orchard in Hawaii, I could not find proteoid roots, yet only a few days earlier I had found them on macadamia nut trees growing in the wild. I learned later that the orchard where trees were dying was heavily fertilized on a regular, basis with phosphorus.
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My motto with fertilizer is natural organic is safest.
If Davey indeed provide a lot of that service then surely adding or switching to a soil beneficial organic program which incorporates some air injection along with the liquid would be more beneficial.
Go send them a link to the thread and see if you get a promotion ... or demotion.
And as far as the mowers go there's plenty of mulcher mowers on the market now which leave very little debri on the surface and blow it back into the lawn. You'll still have the compaction style issues, and the returned mulch probably not getting through the lawn anyway to the soil especially with some of the couch and buffalo types of lawns but it's a step in the right direction..