UKTC Archive

Re: RPA offset for ploughing

Subject: Re: RPA offset for ploughing
From: Julian Morris
Date: Aug 12 2019 11:08:12
I do this frequently for mature hedgerows, where a conventional 12x DBH plot 
of RPA is just not realistic. The ploughed area might well be used annually 
by ephemeral roots, but 5837 defines RPA as 'deemed to contain' roots.

As Jim Quaife indicates, RPA is a 2D representation of a 3D shape, an area to 
represent a volume.

The simplest thing to get over the unconventional RPA is to state in the 
report that rooting is absent to a depth of X centimetres but can be expected 
below that. What in effect this does is to show a RPA that can be 
transgressed to some degree without loss of rooting volume. Therefore close 
to trees in ploughed situations cellweb or even kerbed surfaces can be 
acceptable within a RPA.

One should have no fear of deviating from BS5837 for things liek this 
provided the assumptions are realistic, are stated and are therfore 
justifiable. And one cal always include an indicative cross-section of 
development adjacent to truncated shallow rooting and over relocated deeper 
rooting, for the hard of thinking.

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


Sent: Monday, August 12, 2019 at 10:19 AM
From: "AV Arboriculture" <mike@xxxxxxx.co.uk>
To: "UK Tree Care" <uktc@xxxxxx.tree-care.info>
Subject: RPA offset for ploughing

Has anyone ever come across instances of reducing a tree's root protection 
area because of ploughing activity? If so, have they been justified, or can 
it be justified?

Mike Charkow

Arbor Vitae Arboriculture Ltd




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