UKTC Archive

Re: Watering trees during the establishment phase

Subject: Re: Watering trees during the establishment phase
From: Julian Morris
Date: Feb 10 2020 03:02:26
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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