g'day wayne,

generally mature trees will have found their own water table, the
drippers will keep nutrients availabe for the feeder roots which maybe
is the best you can currently do? if you want to get more water deeper
around the roots maybe look to creating a swale about along the
contour lines wher the feeder roots will be, the feeder roots are
generally not much furhter out that the drip line.

or for trees that aren't planted along contours then ceata a mni dam
at the same point as above these swales etc.,. can be created using
bails of hay/straw or a pile of mulch in a row form.

for future plantins consider plantng along contour lines and at the
same time as planting install say a 1 or 1/2 meter length of the black
plastic ag-pipe with holes in it eitehr side of the tree this will
allow you to get water deeper at watering time.

On Sun, 23 Sep 2007 11:38:56 -0700, "W. Watson"
wrote:
snipped
With peace and brightest of blessings,

len & bev

--
"Be Content With What You Have And
May You Find Serenity and Tranquillity In
A World That You May Not Understand."

http://www.lensgarden.com.au/