On 8/07/2015 7:34 PM, Emery Davis wrote:
On Wed, 08 Jul 2015 13:58:07 +1000, Fran Farmer wrote:

It seems that "root aeration" does not equate to "oxygen saturation in
water". I've decided to become unfixated on the issue as I suspect it's
not important unless I want to go into hydroponics.

That's right.I was interested in oxygen saturation in water because I
was concerned with compacted, wet soil in pots. In that situation, roots
have a difficult time getting oxygen, which they need.

Maybe this link will help illustrate what I'm talking about. It refers
to soil compaction after flooding, but I've heard watering pots over time
compared to this.

http://hillsborough.ifas.ufl.edu/pro...blications/HC-
SoilSaturation.pdf

Bottom line, roots and symbiotic mycorrhizae need oxygen. If the soil is
in good condition and dries out, they get it from pore space in the
soil. If not oxygen saturation (and hence H2O2) can play a role.

Thanks Emery and Nick for clarifying and confirming my understanding on
this issue. I've not ever been tempted by hydroponics (I get into
enough growing issues without that complication) but will stash this
snippet of knowledge into the back blocks of my memory banks just in a
case I ever do become tempted.