Olive Trees Trained to a Single Leader: The Windbreak That Protects and Produces
Along the almond orchard, we observe a row of olive trees trained to a single leader, spaced two metres apart. Six years after planting, they have already exceeded six metres in height, forming a narrow, continuous living barrier. Nearby, an older windbreak managed as free-standing trees shows a less uniform structure. The comparison highlights how the training system can influence vegetation distribution and the functionality of the vegetative wall.
We move into backlighting to
observe the foliage. This is where we identify the characteristic that must be
maintained: a diffuse semi-transparency that allows the wind to pass through
the canopy while reducing its speed. FAO technical guidance confirms the
importance of this permeability: an overly dense barrier can generate turbulence,
while large openings can promote local increases in air speed. The objective,
therefore, is to maintain continuous vegetation with small openings distributed
along the wall.
Pruning follows this principle.
We allow the leader to develop vertically and intervene on lateral branches
that become excessively vigorous, create entanglements, or increase canopy
thickness excessively. In the trees examined, one or two cuts per tree are
often sufficient. These are light interventions that preserve the structure
while allowing the work to be carried out efficiently.
When a branch needs to be
renewed, we shorten it, leaving a spur of approximately 30–40 centimetres, with
its length adjusted according to its position and vigour. At the points pruned
in previous years, new vegetation is already visible: renewal proceeds
gradually, while the retained branches continue to contribute to production.
Height also determines the extent
of protection. The FAO reports downwind effects extending up to approximately twenty times the height of the barrier,
although effectiveness varies. The windbreak belts spaced every 60–70 metres,
as considered during the visit, should therefore be designed by taking into
account barrier height, prevailing wind direction, permeability, and the
requirements of the almond orchard.
CREA includes windbreaks among the measures for adapting
agriculture to climate change. In this case, the protective function
is complemented by an indicative yield of 7–10 kilograms of olives per tree,
representing an interesting contribution from a structure that occupies a
relatively limited strip of land.
The design must also take into account shading and competition for water in the vicinity of the trees. Effective windbreak management means finding the right balance: protecting the main crop, controlling the space occupied by the trees, and maintaining a vegetative wall capable of renewing itself and producing over time.
Editorial Note:
Original content by Agronomist Dr
Vito Vitelli, developed and optimised with the support of artificial
intelligence tools for educational, informational, and technical communication
purposes.
Educational activities carried out in collaboration with:
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