Hi Will, I don't agree with you entirely here. A couple of remarks:
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Originally Posted by Will_Heath
Sterile is a key word here. What about the beneficial Bactria and fungus that are important to plants?
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When you use organic fertilizer on a sterile inorganic medium (e.g. pure akadama) these develop quickly (perhaps by windborne spores - I don't know.)
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Straight turface will drain at the same rate and retain the same amount of water, air, and nutrients no matter what species of tree is planted in it. How then, besides having 18 different watering schedules would you adjust for dry loving trees such as pines or wet loving trees such as Wisteria?
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Though I adjust component sizes according to pot size, I use exactly the same mix across species - with good results. I water everything to saturation, daily. With a good well-draining inorganic mix, this is not a problem for the dry-loving species (say, bristlecone) nor for the wet-loving (say, wisteria.) Presumably this is easier to get away with in Seattle than in Dallas, but anyway....
Cheers,
Carl