6 - Vineyard Management Flashcards
Describe 3 considerations that affect site selection
- Environmental Considerations
- Business Considerations
- Grape Varietal
Give 3 reasons why environmental conditions are important.
The data collected about the environmental conditions will determine:
The grape variety that can be grown.
The optimal planting density that can be determined.
The appropriate training and trellising system
What business considerations need attention in site selection?
Proximity to infrastructure
Labour Availability
Machinery Accessibility
Land Cost
Why is grape varietal selection important?
It must be in demand
It must meet legal requirements.
It must suit the climatic conditions.
How are new plantings given the best chance of survival?
Vegetative Clearing
Fertilisation
Plastic Sleeves (protect against animals)
Irrigation
What is the ultimate goal with vineyard management?
To maximise production of fruit at the desired quality as economically as possible.
What is vine training?
Vine training refers to the shape of the permanent wood on a vine.
Name 2 vine training systems.
- Head Training.
2. Cordon Training.
Describe a head trained vine.
Little permanent wood
Consists of either a trunk or a trunk with a small number of short arms.
Describe a cordon trained vine.
A trunk with 1 or more permanent arms/cordons.
Can consist of more arms (nutrient rich soils and heavy rainfall)
Give one disadvantage and one advantage of cordon trained vines.
Advantage: Better for machine harvesting.
Disadvantage: Longer to establish.
Why would a vine be high trained?
Why would a vine be low trained?
High: To avoid frost damage
Low: To allow it to benefit from the heat of the soil.
What is vine pruning?
Pruning is the removal of unwanted leaves, canes and permanent wood.
Why is pruning performed?
- It shapes and limits vine size.
2. It determines the number and location of buds.
Name 2 pruning systems?
Spur Pruning
Replacement Cane Pruning
Describe spur pruning.
1 year old wood, cut to 2-3 buds distributed along a cordon or on top of a trunk.
Describe replacement cane pruning.
Cane = Long section of 1 year old wood holding 8-20 buds
What is Guyot Training?
Head trained, replacement cane pruned vines.
What is the purpose of summer pruning?
- Targets the canopy to restrict vegetative growth.
- Encourages ripening by diverting sugar production to grapes.
- Leaf stripping exposes grape bunches to sunlight for ripening.
What is the cost consideration with replacement cane pruning?
It’s more complex, requiring skilled labour to choose suitable canes.
What is a bobelet system?
Head trained,
Spur pruned
Untrellised.
What is the canopy?
The canopy is composed of all the green parts of the plant.
What is a trellis and why is it used?
A trellis is a permanent structure of stakes and wires.
A trellis is used to support replacement canes and a vines annual growth.
Describe an untrellised vine.
An untrellised vine is one where the shoots are unsupported and hang toward the ground. They are typically head trained and spur pruned.
What climates best suit untrellised vines? Provide 2 vineyard areas where this system is used.
Warm, dry sunny regions.
Southern Rhone.
Barossa Valley, Australia
What is the advantage of an untrellised system?
The shade it provides protects the grapes from extreme sunlight
What are the disadvantages of untrellised vines?
The lack of airflow can promote or encourage disease.
The shade provided can impede ripening.
Are untrellised vines hand or machine harvested?
Hand harvested.
Describe a trellised vineyard
A line of posts joined by wire, to which canes and shoots are afixed.
Give 3 reasons why a trellised system might be used
- Young shoot arrangement can control exposure.
- An open canopy provides for air circulation
- It aids in the mechanisation of harvest by positioning the leaves and grapes at specific heights.
What is VSP?
VSP is a trellising technique in which the vines shoots are trained vertically and tied to the trellis forming a single narrow canopy.
What is the advantage of VSP
The canopy is open, aerated and shade free.
Avoids disease. promotes ripening.
What adaptation can be used in VSP to limit exposiure.
The tops of the vines can be allowed to grow out and flop down, providing exposure protection.
Define vine/vineyard density? The unit of measure and the usual range of density.
The numeber of vines planted per unit area.
Typically expressed as vines/hectare.
1,000-10,000 vines/hectare
What level of density best suits areas with limited water supply, and why?
Low density.
Allows absorption of nutrients and water from a large area without competition.
What level of planting density is best suited to areas with limited nutrients and sufficient rainfall. And why?
High density.
Promotes competition between vines, restricting vegetative growth.
Best practise with this density level is to check bud numbers after winter.
What density system is most widely used in Europe?
High density with strict bud control
What level of planting density is best suited to areas with high nutrient levels and sufficient rainfall.
Where can this be used?
And the advantage of it?
Low density with multiple cordons/canes.
Fertile New World Areas
Good quality wines at high yields.
What is vine yield?
The unit its measured in?
Measure of the amount of grapes produced.
Tonnes/hectare
Hectolitres/Hectare
Explain why yields need to be managed?
Legal requirements.
Contractual obligations
Managing winery tank space.
How are yields estimated?
Number of buds on the vine after winter pruning.
What factors can affect vine yields?
Frosts
Poor Fruit Set
Insects and Pests
What is green harvesting?
Green harvesting is the removal of immature grapes shortly after veraison to limit yields.
Why is green harvesting risky?
If badly timed, the vine will compensate by growing bigger grapes, diluting flavours and producing the same yield as originally projected anyway.