Good question.

The element sulfur would lower pH. However it keeps reverting back.

You could add pine needles.

Two good articles of pH:
http://www.treedictionary.com/DICT2003/shigo/CHEM.html

http://www.treedictionary.com/DICT2003/shigo/RHIZO.html

In Fact I just searched for pH and found it to be mentioned in most of these
article.
http://www.treedictionary.com/DICT2003/shigo/index.html


--
Sincerely,
John A. Keslick, Jr.
Consulting Arborist
http://home.ccil.org/~treeman
and www.treedictionary.com
Beware of so-called tree experts who do not understand tree biology.
Storms, fires, floods, earthquakes, and volcanic eruptions keep reminding us
that we are not the boss.

"CORVIDSTATION61" wrote in
message ...

Hi,
Just a quick one.
I know how to increase the soils PH. But what do i add to bring it
down.
Thanks Mark




--
CORVIDSTATION61