Port Grapes and Growing Environment Flashcards
What is the name of the region in which Port is made?
The Douro
How large is the Douro? How much of it is planted to grapevines? How much of it is registered DO Porto?
250,000 ha total
43,500 ha under vine
32,000 ha registered DO Porto
What is the climate in the Douro? What are the typical high and low temperatures annually?
A warm continental climate with summer temperatures reaching 40⁰C and winter temperatures in the freezing range.
It is also dry.
What makes the Douro wine region drier and hotter than the nearby towns of Porto and Vila Nova de Gaia?
Farther distance from the Atlantic
The Serra do Marão mountain to the west, blocking cooling influences
Where are Porto and Vila Nova de Gaia in relation to the Douro?
70km to the west
Is the Douro divided into sub regions?
Yes, the Baixo Corgo, Cima Corgo, and Douro Superior
Does the vineyard area in Douro follow any geographical features or is it relatively freely planted?
The region itself follows the path Douro river and vineyards are planted in its vicinity and along its estuaries
How does temperature and rainfall compare among the sub regions of the Douro?
Baixo Corgo, the most westerly, is coolest and wettest (900mm rainfall per year)
Cima Corgo is warmer and drier than Baixo Corgo (700mm rainfall per year)
Douro Superior, the most easterly, is the warmest and driest (450mm rainfall per year)
Which of the Douro’s three sub regions is the least planted? Why?
Douro Superior due to the increased drought risk due to low rainfall. The flatter land, however, has recently seen increased plantings to allow for mechanization.
True or False
The climate in each of the Douro sub regions is largely uniform and climactic assumptions can be made about vineyards based on their sub region
False. The winding Douro and its myriad tributaries form a vast number of microclimates that affect viticultural quality. Temperature and average sunlight may differ in a single vineyard.
What type of soils are prevalent in the Douro?
Shallow stony soils with a schist bedrock
What is unique about the bedrock in the Douro? How does this affect vine growth?
The bedrock layers are positioned vertically due to ancient tectonic movements. This allows vines to dig their roots through the layers into subterranean water sources.
How is the Douro demarcated in relation to schist soils? Why?
The boundary of the denomination almost exclusively follows the borders of the schist deposit in the area. Vines are able to reach through the schist to the water table, but unable to do so through the granite bedrock in neighboring areas.
Is irrigation permitted in the Douro?
No, unless there are extreme circumstances requiring it, such as hydric stress on the vines.
What are the three vineyard layouts in place in the Douro?
Socalcos
Patamares
Vinha ao Alto
What is the traditional vineyard layout of the Douro?
Socalcos
What are Socalcos?
A narrow, terraced vineyard supported by walls of dry rock traditionally used in the Douro. They permit planting densities up to 6,000 vines per hectare.
Are Socalcos suitable for vineyard mechanization?
Not generally, but the terrace can be planted at lower densities to permit tractors to enter
True or False
Socalcos can not be converted to other vineyard layouts
True. They are a UNESCO protected feature of the Douro
What are Patamares?
A terraced vineyard in the Douro that is supported by a steep earth ramp instead of a stone wall.
Are Patamares suitable for vineyard mechanization?
Yes, by means of a ramp that runs diagonally up the slope
True or False
Patamares are cheaper to implement and maintain than Socalcos
True, though erosion and weed growth on the ramps can be problematic
What is the typical planting density in Patamares vineyards? Why?
3,000-3,500 vines/ha
The ramps used for mechanization take up a lot of space
Is there more than one kind of Patamares?
Yes. Large, wide Patamares were designed for older, bulkier mechanized tools and permits two rows of vines to be planted
Modern, narrow Patamares only support one row of vines and are carved by modern bulldozers using laser precise technology.
What are the advantages and disadvantages of the two styles of Patamares used in the Douro?
The older, wider Patamares are able to plant two vines but there is uneven ripening as the sunward row receives more sunlight.
Newer Patamares are tilted slightly toward the slope, which improves water retention and reduces erosion. The single row ensures the crop will fully ripen but reduces yields.
What is Vinha ao Alto?
A vineyard method used in the Douro where vines are planted in vertical rows up the side of a hill
What are the advantages and disadvantages to using Vinha ao Alto?
It is inexpensive to plant and maintain, and it allows for planting at 5,000 vines/ha.
Water run-off and erosion can be a problem and mechanization cannot be used in this configuration if the incline is at 40% or greater.
Which vineyard configuration is most likely to be used in the Douro if the incline of a hill is 40% or greater? Why?
Patamares, to permit for mechanization
What vine training is used in the Douro?
Cordon trained, spur pruned
Head trained, cane pruned
VSP trellising
What is the intention of the vine training methods used in the Douro?
To ensure even sun exposure and accessibility to mechanization where possible
What is the goal of summer pruning in the Douro?
To ensure sun exposure for grape ripening
Which rootstocks are widely used in the Douro? Why?
110R and 1103P, both of which are V. rupestris and V. berlandieri hybrids.
They are tolerant of drought
What is the primary concern when planting new vineyard in the Douro?
Maximizing vineyard area, specifically the vine density, vineyard layout, and planting material (varietal, rootstock, etc.)