UKTC Archive

Re: Watering trees during the establishment phase

Subject: Re: Watering trees during the establishment phase
From: Ben Rose
Date: Feb 14 2020 07:33:11
Hi Julian,

Thanks for your input.I think that the table needs to have more categories to 
cover the range of stock sizes now available. I quite often see 30-35cm stock 
planted nowadays and for these to succeed its crucial that they receive 
enough water in the establishment phase. I know a tree officer who always 
uses 30-35cm stock and they routinely irrigate them with 150 litres of water. 
They use contractors to water the trees and watering bags with RFID tags. 
They can monitor the contractor's work because an electronic record is 
generated every time the contractor fills up the bag.

I'm going to keep working on a guide.

Best regards,

Ben


Sent: Monday, February 10, 2020 at 3:02 AM
From: "Julian Morris" <jamorris@xxxxx.com>
To: "UK Tree Care" <uktc@xxxxxx.tree-care.info>
Subject: Re: Watering trees during the establishment phase

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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