UKTC Archive

Re: Watering trees during the establishment phase

Subject: Re: Watering trees during the establishment phase
From: Wayne Tyson
Date: Feb 10 2020 06:49:10
A probe will pick up wetness, and any odor will indicate anaerobic
conditions. It's all about having *available* water per *cubic* unit of
measure.

Calculations need to consider the amount of available water present, and
the AWC known. The biggest mistake in tree irrigation is not getting water
down deep enough, at least in these parts.

Wayne

On Sun, Feb 9, 2020 at 7:02 PM Julian Morris <jamorris@xxxxx.com> wrote:

Yes. an as and when required spec is only good if 'required' is defined.
If it can be defined at all, soil moisture level either gauged by touch or
by meter, would strictly speaking need to be measured.

Too much water can be as damaging as too little.

Just looking at your suggested figures, I took the mid point of the middle
size girth 15cm, and girths of 10cm and 20cm, and  the proposed rate
relative to stem cross sectional area. For the middle and upper sizes this
was about 4 1/2 litres per cm2 csa. But for the smallest size the rate is
only 2 1/2 L/cm2 csa. If csa can be used as an indicator of water
requirements, if the smaller size rate is to be proportionally the same as
the others it should perhaps be 35 litres.

And simplistically, if a rate of 4 1/2 L/cm2 is right then the 5 litres as
and when required would be the daily requirement for a 10cm girth tree.

This seems intuitively too high.

If instead the 20L a week for the smallest trees is right, then the
corresponding rate for middle and large size trees would have to be 45L and
80L respectively.

I can send the calculations if you want them.

Julian A. Morris - Professional Tree Services
jamtrees.co.uk  and  highhedgesscotland.com
0778 XXX XXXX - 0141 XXX XXXX


Sent: Sunday, February 09, 2020 at 1:53 PM
From: "Ben Rose" <benrose@xxxx.co.uk>
To: "UK Tree Care" <uktc@xxxxxx.tree-care.info>
Subject: Watering trees during the establishment phase

So recently I read a specification produced by a large and
well-respected landscape architecture firm that recommended watering
semi-mature trees with '5 litres of water as and when required'. I set them
straight but it made me realise that there isn't much clear guidance out
there.

I'm now putting together my own guide and have come up with the attached
table. I would be interested to hear what others think about what I'm
suggesting. Any comments would be welcome, on or off forum.

Also, I'd be very grateful if anyone was willing to share their
irrigation specifications with me so that I can hopefully produce a
practical guide.

Thanks in advance,

Ben


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