UKTC Archive

Re: RE: Watering trees during the establishment phase

Subject: Re: RE: Watering trees during the establishment phase
From: Wayne Tyson
Date: Feb 11 2020 15:57:10
Water requirements (apart from available water levels in the soil) are
proportional to evapotranspiration. Here in California, we have weather
stations with lysimeters to measure ETo through a program called CIMIS to
help determine irrigation requirements. One can interpolate for one's
location.

"Establishment" is a tricky word, but new plantings should be irrigated to
the depth and width of the tree's root "ball" plus a fudge factor, usually
double the cubic volume involved to account for the expansion of the root
system (aka "establishment"). Once the trees have developed a large enough
cubic volume of soil containing roots, and IF there is available water
present from natural sources, irrigation can be stopped. Here in Southern
California, it is relatively rare to find sites where such conditions
exist, and we frequently end up with dangerously shallow-rooted, highly
stressed trees, especially since many areas have near-surface impermeable
strata (somewhat akin to shallow water tables in other climes and geology).

The management of non-indigenous plants is commonsensically based on the
conditions found in their native land. The closer one comes to duplicating
that, the better, so the theory goes, the plant will perform.

Drought stress (due to weather patterns or failure to match those
conditions) commonly results in stress and death of affected portions of
the root system (there's no free lunch/drinks), which ultimately affects
the vascular system, leaves, twigs, branches, and the entire tree.
"Dieback" can be one reliable (if a bit late) indicator of said stress. The
wilting point is seldom known or detected by grounds "managers." Some
plants are adapted to deal with variations in soil moisture, some not so
much so.

Vegetation is usually a reflection of the site conditions under which it
grows--oases in the desert being one extreme example; growing "tropicals"
in a temperature-controlled glasshouse might be another. And, of course,
jamming trees into little openings in large expanses of pavement, would be
another. Making unrealistic demands upon an organism is a regrettable
"reality" for trees and those who "love" them.

Stress, in other words, tends to keep plants from getting "too big for
their britches." Bigger "britches" may need to be provided. If reality is
replaced with fantasy, the end results are not always pleasant.

Wayne

On Tue, Feb 11, 2020 at 4:01 AM Brewster, Ian <Ian.Brewster@xxxxxxx.co.uk>
wrote:

The difficulty here is matching the frequency as the trees would likely be
watered daily and fixed to some light operated resistor switching on/off or
some dampness detector, non of which would appear within an Arb contract
spec for non nursery locations.


Sent from my Samsung Galaxy smartphone.
The difficulty here is matching the frequency as the trees would likely be
watered daily and fixed to some light operated resistor switching on/off or
some dampness detector, non of which would appear within an Arb contract
spec for non nursery locations.


Sent from my Samsung Galaxy smartphone.



-------- Original message --------
From: Alastair Durkin <ADurkin@xxxxxxxxxx.gov.uk>
Date: 11/02/2020 11:32 (GMT+00:00)
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: RE: RE: Watering trees during the establishment phase

Surely this would be easy to answer for container grown trees? We just
need to ask the growers how much water they apply with the drip/irrigation
systems per week in times of no rainfall.

Alastair


-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info 
<uktc-request@xxxxxx.tree-care.info>
On Behalf Of Julian Morris
Sent: 11 February 2020 10:56
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: RE: Watering trees during the establishment phase





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NPS
 -------- Original message --------
From: Alastair Durkin <ADurkin@xxxxxxxxxx.gov.uk>
Date: 11/02/2020 11:32 (GMT+00:00)
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: RE: RE: Watering trees during the establishment phase

Surely this would be easy to answer for container grown trees? We just
need to ask the growers how much water they apply with the drip/irrigation
systems per week in times of no rainfall.

Alastair


-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info 
<uktc-request@xxxxxx.tree-care.info>
On Behalf Of Julian Morris
Sent: 11 February 2020 10:56
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: RE: Watering trees during the establishment phase





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



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The UKTC is supported by Bosky Trees arboricultural consultancy
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