The vine

17 important questions on The vine

Other than carbon dioxide and nutrients, what three things does a vine need to complete its annual growth cycle?

Sunlight, water and heat

True or false: The aspect of a vine has no impact on the heat it receives.

False. The aspect of the vine determines how much sunlight, and partially, how much heat it then receives.

True or false: Fog can have a positive impact on a vine, particularly in an area that may struggle to produce high-quality grapes.

True. Fog can help cool the grapes. In Napa County, USA, morning fogs moderate the temperature in the vineyard, which means the grapes retain acidity and fresh fruit flavours.
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True or false: Diurnal range is the difference between the hottest and coldest months of the year.

False. Diurnal range is the difference between the daytime and night-time temperatures. Cool nights help slow the loss of aromas and acidity in the grapes during the ripening. Warm nights accelerate ripening.

What are  the 4 vineyard management techniques that are used to control frost.

  1. Thoughtful vineyard design
  2. Heaters
  3. Wind machines
  4. Sprinklers

There are a number of times in the year when low light levels can cause problems for the grape grower. Sunlight enable vines to successfully  ...  .

photosynthesise

Intensely sunny conditions can cause  s...  , leading to  b....  flavours developing in the grape skins.

Sunburn + bitter

Grapes can be arranged on  t....  to maximise sunlight in the canopy where required and  m....  where it's too strong. 

Trellises + minimised

Rainfall is the most important source of water but, if it is insufficient, then it can be supplemented with irrigation if local law permits. Name the 3 main irrigation techniques from most advanced to cheapest

  1. Drip irrigation: Each vine has its own dripper that is computer controlled
  2. Sprinklers: Still widely used, but they waster a lot of water. Can also be used for frost protection.
  3. Flood irrigation: only possible on flat or very gently sloped vineyards and with access to large quantities of water.

What are the 2 main water hazards?

  1. Drought
    1. Short time: vine stops transpiration to keep resources
    2. long time: water stress resulting in stop of photosynthesis. Leaves wilt and grapes fail to ripen.
  2. Too much water
    1. Vine will continue growing shoots and leaves during ripening season, leaving less sugar for ripening grapes.
    2. Increase of shading because of the extra shoots and leaves restricting grape ripening.
    3. Waterlogged soil can cause the roots to become saturated and die.

Name 3 factors affecting sunlight.

  1. Latitude: Day length during summer is longer when vineyard is further away from the Equator. Extra sunlight helps grapes ripening in cool climate areas.
  2. Seas and lakes: Vineyards near large bodies of water experience more cloud cover.
  3. Aspect: Steeper slopes benefit more from sunlight. The further away from the Equator the more benefit there is in steeper slopes catching more sunlight.

Complete: Temperature drops as altitude r.... . This can be advantageous in areas close to the .... As they might otherwise be t... .... .

Rises + Equator + too hot.

Complete: Damp conditions that follow rainfall also encourage the spread of .... .... .

Fungal diseases.

Complete: ... ... Shortly before harvest time can cause he berries to ... Excessively. This ... The flavour in the wine they produce and in extreme cases the berries swell so much that they split, which attracts ... ... .

Heavy rain + swell + dilutes + fungal diseases.

These climates are characterised by cool to moderate temperatures and a low annual difference between the hottest and coldest months. Rainfall tends to be evenly spread throughout the year.

Maritime climate

Example: Bordeaux

These climates have the greatest difference in temperature between the hottest and coldest months. Short summers with a large, rapid temperature drop in autumn.

Continental climate

Examples: Chablis, Champagne, Belgium

These climates have a low temperature difference between the hottest and coldest months, but the summers are warm and dry.

Mediterranean climate

Examples: The Mediterranean, Coastal California, Chile, South Africa and South East Australia.

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