READ THE DIAGRAM
After reading about the site, divergence occurs during fermentation.
Selecting an item will highlight and compare the corresponding section.
The last two boxes are not in chronological order, but rather represent process options that branch off from the raw materials. The lines in the diagram do not indicate any quality ranking. To the supporting reference ↓
FIELD NOTE 01
Follow the valley from west to east
The Douro is a highly undulating region that spreads along the river. The Marão Mountains block Atlantic influence, making dryness and summer heat important further inland. Three subregions are arrayed from west to east: Baixo Corgo, Cima Corgo, and Douro Superior.
In addition to the difference between west and east, even within the same valley there are changes in vineyard elevation and slope orientation. A single map point serves as a regional marker and is not a representative climate observation point for the entire appellation.
FIELD NOTE 02
Vineyards on slopes and grape varieties.
Terraced vineyards are seen on schist slopes. The shape of the vineyard is not only about scenery, but also serves as an entry point to consider working conditions and planting arrangements. For grape varieties, check Touriga Nacional, Touriga Franca, Tinta Roriz, etc.
Some old vineyards are planted with multiple varieties. Blending wines that were vinified separately and planting multiple grape varieties in the same vineyard are not the same thing. If the materials mention mixed planting, your understanding will improve by reading about the unit at which harvesting and vinification were carried out.
FIELD NOTE 03
How far to allow fermentation to progress
There are both Port and unfortified red and white wines from the same region. Even with the same raw material sources, in Port, the addition of spirits during fermentation affects the residual sugar and final alcohol. When comparing with unfortified wines, first indicate this difference in process.
Would also like to confirm the vessel and maturation afterward. Even among Ports, the approach differs between the Ruby and long-aged Tawny styles. By moving back and forth between the vineyard map and process diagrams, differences not explainable by name alone can be clarified.
FIELD NOTE 04
Layer the east-west trend of dryness with differences in slopes.
Arranged from west to east: Baixo Corgo, Cima Corgo, Douro Superior. You can observe that the influence of the Atlantic weakens and inland conditions increase. According to IVDP explanations, precipitation decreases from the west side towards the Spanish border.
However, even if you divide the subregion into three, altitude and aspect differences remain within the same area. Do not use a single temperature to represent both upper slopes and valley bottoms, or sun-facing and opposite-facing slopes; this is an important consideration when moving on to vineyard data.
Basis for this section:IVDP | Douro region, climate, and soils ↗
FIELD NOTE 05
Interpret schist and terraced vineyards as working conditions.
IVDP gives detailed explanations of the region’s soils and topography. Here, what you want to check is not just replacing soil names with aroma names, but rather the conditions for root and water movement, slope management, planting layout, and workflow. In old, mixed-planted vineyards, it is also important to compare whether the varieties ripen at the same time or what units are used for harvest and fermentation.
Basis for this section:IVDP | Douro region, climate, and soils ↗
FIELD NOTE 06
From the same origin, the fermentation diverges.
For Port, alcohol is added during fermentation to retain residual sugar. When comparing to unfortified wines from the Douro, first highlight this branching point, then add vessel and maturation details. It’s better to separate the roles of raw material and process than to explain sweetness only by vineyard differences.
If you divide tasting notes into two steps: “where it comes from” and “how far sugar was fermented,” you can explain wines from the same place as different styles.
Basis for this section:IVDP | Port winemaking ↗
In addition to shared regions, for Port, it is necessary to explain the process of fortification during fermentation.
PAUSE & REFLECT
Check your understanding.
Can you explain the sweetness of Douro reds and Port using only the land?
Read the explanation ＋
In addition to shared regions, for Port, it is necessary to explain the process of fortification during fermentation.
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View saved notes →Courses related to this question
Touriga Nacional: Comparing fermentation in dry red and Port →
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Sources and reference materials
These are the reference materials for the main text. For details of production regulations, consult the current documents. For individual wine specifications, refer to materials for the relevant vintage.
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