|Authors: ||A. Fini, F. Ferrini, P. Frangi, R. Piatti, M. Faoro, G. Amoroso|
|Keywords: ||reduction cut, removal cut, SPAD, winter pruning, woundwood coefficient|
The aim of this work was to evaluate different periods of pruning during the dormant season in order to determine which pruning period promote a fast wound healing and least affects tree regrowth and physiology.
In spring 2005, 28 uniform 10-12 cm circumference sycamore maples (Acer pseudoplatanus L.) were planted in an experimental plot at the Fondazione Minoprio.
Trees were allowed to establish and grow undisturbed for three growing seasons.
Thereafter, in winter 2007/2008, plants were pruned according to the following treatments: 1) pruning in December; 2) pruning in January; 3) pruning in February; 4) pruning in March.
In each time of pruning, two cut types were carried out (removal and reduction). All plants were pruned in order to reduce leaf area by 1/3. Trees were pruned again in winter 2009/2010 with the same methods and treatments as in 2007/2008. The following biometric parameters were measured: stem diameter at 1.3 m, wound closure area, percentage of wound closure, base diameter and length of sprouts released or developed within 20 cm of the cut.
Leaf chlorophyll content was measured three times during the vegetative season with a SPAD-meter.
Results pointed out slight differences regarding wound closure, diametric growth of pruned branch, diameter of watersprouts and leaf chlorophyll content, therefore no strict indication of the preferred pruning time for sycamore maple emerged from this study.
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