Ch 5 The Growing Environment - Sunlight

Question 1

Why does the vine need sunlight?

Answer 1

To carry out photosynthesis which provides glucose for growth and ripening. Flowering and fruit set also benefit greatly from plenty of sunlight.

Question 2

Which factors affect the amount of sunlight in the vineyard?

Answer 2

Latitude - further from equator = more sunlight
Aspect - equator-facing and steeper slope = more sunlight. Maximise at higher latitudes / cooler climates;
Seas and Lakes - nearby normally means more cloud cover however there can be redirected sunlight from surface of water

Question 3

What impact can low light levels cause?

Answer 3

1. Cloudy conditions, which can reduce sunlight, during flowering and fruit set can reduce crop size;
2. During growing season it can reduce photosynthesis and can mean grapes dont ripen fully ie more acidic wine

Question 4

What impact can excessive sunlight levels cause?

Answer 4

Sunburn can lead to bitter flavours in the skins.