Toppling -- getting to the root of the problem

Trewin, Robin
May 2007
New Zealand Tree Grower;May2007, Vol. 28 Issue 2, p30
The article discusses the problem of tree toppling and offers some prevention measures. Research trials conducted in the 1970s showed that improving tree stability involved trimming the roots, first in small bundles then at planting, a positive pull up, planting hole fill and positioning roots straight and down. On fertile farm sites, at least 15 centimeters of the stem should be buried in a hole that should be over 30 centimeters deep. To ensure quality as well as compare plantings to established specifications, quality assurance indicator plots may be built and assessed over a five-year period, taking note of the incidence of toppling, root and stem strangulation. Roots of toppled and stable trees may also be analyzed for depth assessment and photographed for ease of reference.


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