That terrainaeration guy is on the right track.
Biggest problem with trees is compaction, need to get some air down there.
Some guys use the Airspade/Airknife for decompaction, hows that work?
IMHO I think deep watering, deep fertilizing etc is mainly BS.
Pretty outrageous and bold statement but if there was little compaction and good aeration then any drench will suffice as
deep enough root fertilization.
I've look at hundreds of excavated sites and no doubt the feeder roots are in that top thin layer of soil. My belief,
yet to be quantified is that deep roots such as tap roots are supplied not sourced roots.
What does that mean? I believe the rest of the rhizosphere actually feeds that root to be the depth miner for reasons other than water/nutrient and oxygen.
But hey, it's a theory. The reasoning is that all the things roots need aint down there ... so why go there? Support, storage and anchorage. And if there's any bonuses along the way of course they'll capitalize.
