UKTC Archive

Re: RPA offset for ploughing

Subject: Re: RPA offset for ploughing
From: Wayne Tyson
Date: Aug 13 2019 17:46:05
Back to basics. Normal root systems radiate outward considerable distances
from the base of the tree, often well beyond the crown. Root strength
(resistance to lateral forces) is almost entirely dependent upon the fine
root/soil matrix. This can be crucial where the bulk of the root system
lies within the ploughed part of the soil profile, such as in those where
deeper penetration is restricted. Any compromise of that root system must
reduce the resistance in proportion to the root matrix lost.

If this is to be done, it might be wise to check for any increase in any
degree of lean and its direction.

I would like to see solid evidence of "displacement" to deeper parts of the
root zone, as hinted (or declared) in one of the other responses. I do not
doubt that there is a point where minor losses of fine roots would only
"trim" the amount of resistance, so as long as the sum of the forces acting
upon the ultimate length of the moment-arm do not exceed the remaining
resistance. The chances of root loss-induced failure might be remote in
such cases, but bear in mind that as the tree grows, the amount of force
applied to the pivot-point will increase geometrically. Think of the tree
as a lever.

One might estimate the amount of fine roots at the edge of the plowed area
by coring, counting, and extrapolating. Estimating the amount of lost
resistance is above my pay-grade.

Then there is always the possibility of encouraging pathogens.


Wayne

On Mon, Aug 12, 2019 at 2:20 AM AV Arboriculture <mike@xxxxxxx.co.uk> wrote:

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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