UKTC Archive

Re: Watering trees during the establishment phase

Subject: Re: Watering trees during the establishment phase
From: Julian Morris
Date: Feb 17 2020 15:16:44
By my rule of thumb (girth x girth divided by 5) the 30cm tree would need 
180L to 250 per week. But you say the TO 'routinely' irrigates with about 
that. It's not just the dosage, it's the frequency. One big soaking a week 
might reach the parts a smaller and more frequent irrigation might not reach. 
I suspect hte answer is not the counsel of perfection but the pragmatic 
realistic prospect of gettign a contractor tin regularly, checking up on him 
and the cost of all this. I'd say better one big soak than two small ones 
when cost is taken into account. And nboth options better than nothing. Or 
than the original 5L as and when required that you referred to.

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


Sent: Friday, February 14, 2020 at 7:32 AM
From: "Ben Rose" <benrose@xxxx.co.uk>
To: "UK Tree Care" <uktc@xxxxxx.tree-care.info>
Subject: Re: Watering trees during the establishment phase

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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The UKTC is supported by Bosky Trees arboricultural consultancy
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