UKTC Archive

Re: RE: Watering trees during the establishment phase

Subject: Re: RE: Watering trees during the establishment phase
From: Wayne Tyson
Date: Feb 15 2020 03:03:47
The fundamentals *must* be understood, e.g., AWC, capillary water, free
water, available and unavailable water, wilting percentage,
evapotranspiration, field capacity, infiltration, percolation, capillary
fringe, anaerobic conditions, aerobic conditions, pore size, bulk density,
etc. With that kind of knowledge, one can develop prescriptions--more or
less. That is, there can be a large fudge factor to make it easy, but
radical departures from the physics involved might have something to do
with high "loss" rates. No reason to have *any *"loss rate" *related to
irrigation* when it comes to the planting of mature trees. When there are
losses, one must determine why, to complete the feedback loop upon which
refined professionalism rides.

Best regards,
Wayne

On Fri, Feb 14, 2020 at 1:39 PM oldoaktree@xxxxxxxxx.net <
uktc@xxxxxx.tree-care.info> wrote:

Ben,

I applaud what you are doing. Without really adding anything to the
discussion, I'd say you need to find a fine line between tree species,
size, water demand, soil and environment and produce an easy to follow
guide.

It's all about catching the majority of people involved in tree planting,
not the extremes on either side who will (probably rightly) pick fault or
be totally indifferent and try to do the least possible.

Any advice/standards/recommendations see wildly differing interpretations
but any advice/standards/recommendations tend to see things causing a
general overall improvement despite the odd glaring horrors.

Look at how BS3998 has come on as understanding has increased. It would
not have, to such a degree, should the first version not have been
envisaged.

Not saying you need to look at a new British Standard, but if you create a
really useful and easy to work with guide, then it should be incorporated
into further revisions of BS8545 for certain.

Best regards

Dave



-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info 
<uktc-request@xxxxxx.tree-care.info>
On Behalf Of Ben Rose
Sent: 14 February 2020 07:36
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: RE: Watering trees during the establishment phase

Hi Jon,

I disagree with what you are saying. If we as arboriculturists can't
explain what the trees need how can we expect landscape architects to write
decent specifications?

A problem shouldn't be ignored just because it's complex - that's head in
the sand behaviour!

Best regards,

Ben


Sent: Tuesday, February 11, 2020 at 10:15 AM
From: "Jon Heuch" <jh@xxxxxxxx.co.uk>
To: "UK Tree Care" <uktc@xxxxxx.tree-care.info>
Subject: RE: Watering trees during the establishment phase

I am afraid that attempting to define how much water a tree needs in
writing is prone to problems when the text is to cover all
eventualities, including idiots who may read the instructions and apply
them to the letter.



This story does have some relevance, so persevere:



I remember a tale told of me in a live forest fire situation; the fire
needed to be put out ASAP, so the radio  message went out "Send the
bowser to location X ASAP, emergency". The two staff members got into
the bowser and drove it like crazy to the fire. Great! Problem solved.
Now put the fire out! The hose was extended, the pump turned on, and a
drizzle of water came out of the hose for a few minutes. No water in
the bowser! No one had told them to fill the bowser with water. However,
the instructions were followed!



So, in a fire season, resources are deployed according the severity of
conditions. Typically a fire index is calculated based on temperature,
wind, relative humidity and previous rainfall. A high index means
every body is on high alert; a low index means that everyone can stay in
bed.



Watering trees has a similar feel. It's raining and has been raining
for the last week. You probably don't need to spend much time watering
your newly planted trees. If it's been 30 degrees C every day for the
last week, and the last time it rained was a month ago, you are
probably going to spend more time watering. You can make it simple -
just water during summer months & you may get waste & complacency
(operators can cheat, get paid for doing nothing); or you could be a
bit more sophisticated and base your watering regime on recent weather.
MORECS might do the trick but the data costs.



Jon






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The UKTC is supported by Bosky Trees arboricultural consultancy
http://www.boskytrees.co.uk/




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To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC is supported by Bosky Trees arboricultural consultancy
http://www.boskytrees.co.uk/