Unit 1 Viticulture- The Growing Environment Flashcards Preview

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Flashcards in Unit 1 Viticulture- The Growing Environment Deck (42):
1

What is the basic building block of the vine?

Glucose

2

What is the photosynthesis equation for a vine?

Sunlight+water+CO2--chlorophyll= glucose

3

At what temp and below is the vine dormant?

10C

4

At what temp does vine growth peak?

22-25C

5

What is the average temp in a cool, moderate, warm and hot climate?

Cool- Below 16C
Moderate- 16.5-18.5C
Warm- 18.5C-21C
Hot- Over 21C

6

Give examples of cool, moderate, warm and hot regions

Cool- Champagne, Mosel, Southern England, Anderson Valley, Tasmania
Moderate- Bordeaux, N Rhone, Rioja, Piedmont, Tuscany, Coonawarra, Marlborough, Napa/Sonoma
Warm- S Rhone, Douro, Jerez, McLaren Vale, Paarl
Hot- San Joaquin Valley CA

7

What is a maritime climate and give examples

Low range of temps, high rainfall, near large bodies of water
Bordeaux, Muscadet, Rias Baixas, Vinho Verde

8

What is a mediterranean climate and give examples

Low range of temps, mild winters, dry summers and most rain falling during the winter
West Coast US, Childe, SE Australia, Cape in SA

9

What is a continental climate and give examples

Wide range of temps- hot summers cold winters, inland
Champagne, Mendoza, central spain, Germany

10

What is an example of a tropical climate?

India and Brazil- no dormant period, vines not as productive

11

What are the 4 main advantages of having a body of water near a vineyard site?

1. Reflect sun's rays
2. Provide source for irrigation
3. Reduce risk of ground frost
4. Provide morning mists to develop noble rot

12

What fungal disease is more common in vineyards near bodies of water?

Downy mildew

13

What negative effects can a thick canopy have?

- reduce flower initiation and berry set
- higher levels of acid retention in grapes
- reduce sugar accumulation
- encourage competition between shoot tips and berries for sugar which reduce berries ability to ripen

14

At what temp does injury to dormant vines begin, and what temp is a site unsuitable for vines?

-15C, -20C (or if mean temp for a month is less than -1C)

15

What is the problem with the heat summation system?

Relationship between between vine growth and temp is not linear- it slows down when temps are above 30C

16

What are the main trends as the region gets warmer in the EU Zones A to C?

- min potential alcohol requirement increases
- level to which must can be enriched decreases
- deacidification becomes illegal, acidification becomes legal

17

How does vine density affect how much precipitation is needed?

The higher the density, the more precipitation is needed

18

In what climate is it important that soil can retain water?

Mediterranean- because most rain falls in winter

19

What three regions are prone to hail?

Mendoza, Piedmonte, Burgundy

20

How does high rainfall affect the berries?

-can cause fungal disease
-reduce fruit set
-cause bunch compaction and berry splitting,
-dilute berries if before harvest

21

Why can it be beneficial to have increased lear area and canopy in cool temps?

Because the rate of photosynthesis slows, and it takes a larger leaf area to ripen fruit

22

What time is leaf removal around the fruiting zone commonly practiced and why?

Several days before harvest to ensure full ripening while minimizing burn risk

23

What is the relationship between the amount of sugar in a grape and heat vs sunlight?

Sugar increases with photosynthesis from sunlight, while other metabolic needs increase with temperature. In hot, cloudy conditions like Hunter Valley sugar is low while in cool, sunny conditions sugar can be high (Alsace)

24

How many hours are needed to produce ripe fruit in vitis vinifera?

1250 hrs

25

Why do wines grow best on soils with low fertility?

-restrict canopy growth
-are often stony and well drained

26

Arrange in line from smallest to largest diameter:
Fine sand, sand clay, gravel, and silt

Clay, silt, fine sand, sand, gravel

27

What soil retains the most moisture?

Clay, because it is made up of very small particles

28

What is the ideal soil texture and why?

Loam, balanced mix of clay, silt and sand. They combine nutrient holding abilities of clay with the good drainage of sand

29

How is limestone formed?

Through the deposition of shells and skeletons of marine animals. Consists of calcium carbonate and is alkaline and free draining

30

How is granite formed?

By solidified magma produced by volcanoes.

31

What is humus?

Decomposed organic matter

32

What is the minimum amount of water vines need during the growing season?

500 mm

33

What can aeration do to the soil?

Provide oxygen to aerobic organisms, removes CO2, provides roots with oxygen

34

How can soil compaction affect the vineyard?

Poor rain infiltration, poor soil structure, reduced drainage, aeration, and root penetration

35

What are the major elements of soil?

Nitrogen
Phosphorous
Potassium
Calcium
Sulfur
Magnesium

36

What are minor or trace elements of soil?

Boron
Manganese
Copper
Iron
Molybdenum
Zinc,
Cobalt
Chlorine
Silicon

37

What element is an essential component of chlorophyll ?

Magnesium

38

What element regulates cell acidity and is an important component of cell walls?

Calcium

39

What element regulates the flow of water and sugar in the plant?

Potassium

40

What element is key in energy fixation, root growth and ripening?

Phosphorous

41

What type of growing conditions for vines produce the best fruit?

Densely planted, small vines, growing on infertile soils

42

What is the lowest pH you can grow a vine in?

5