WINETECH Technical Yearbook 2021

TABLE 2. Harvest date, as well as sugar, acidity and pH in the must during harvesting of the 17 cultivars in 2020/21.

y = 1.7114x + 0.0004 R² = 0.8363 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 2019/20 Cane mass (t/ha) 2018/19 Cane mass (t/ha) Malbec Assyrtico Shiraz Marselan Durif Piquepoul blanc Macabeo Chenin blanc Vermintino Verdelho Chardonnay Tempranillo Arinarnoa

Sugar (°B)

Acidity (g/L)

Cultivar

Harvest date

pH

FIGURE 6. A comparison between the first and second year’s cane masses. The broken lines indicate the average

Arinarnoa

25 February 25 February 17 February 17 February 08 February 17 February 17 February 08 February 05 February 08 February 05 March 05 March

24.1 ab* 23.8 ab 23.9 ab 23.3 b 24.7 a 24.2 ab 24.0 ab 23.9 ab 21.6 bc 22.1 ab 21.4 bc 21.0 bc 21.1 bc 23.1 b

9.7 a* 9.8 a 6.1 c 4.9 d 8.1 b 7.6 c 7.2 c 5.0 d 5.9 c 8.8 b 6.9 cd

3.34 ef*

Marsanne Pinotage Touriga na ҫ ional Grenache

Durif

3.25 f

Grenache noir

3.37 ef

Malbec

4.04 a

Marselan Pinotage

3.44 de

3.58 c 3.64 c

cane mass during the respective seasons.

Shiraz

Tempranillo

3.56 cd

Touriga naçional

3.81 b

Assyrtico

3.30 cd

Chardonnay Chenin blanc

3.56 a

7.2 bcd

3.46 ab 3.33 cd 3.48 ab

Macabeo Marsanne

03 March

7.5 cd

10 February

6.3 c 9.4 a

RIPENING AND YIELD

harvested at lower sugar contents than the target. With the exception of Malbec, the total acidity was above 5 g/L for all the red cultivars. In the case of the white cultivars, the total acidity was 6.3 g/L. As expected, the variation in pH was linked to the total acidity. In the case of Grenache noir, Tempranillo and Macabeo, the pH was however lower compared to the corresponding total acidity in the must.

Piquepoul blanc

03 March

20.5 c 23.1 a

3.22 d

Verdelho

05 February 08 February

7.5 bc 7.2 cd

3.38 bc 3.47 ab

The aim was to harvest the red and white cultivars at 24°B and 22°B respectively. Most cultivars were able to be harvested close to these targets (table 2). Touriga na ҫ ional, one of the late red cultivars, had to be harvested at 23.1°B to prevent serious crop losses. For the same reason Macabeo and Piquepoul blanc had to be

Vermintino

21.5 bc

* Numbers followed by the same letters within a column do not differ significantly (p ≤ 0.05).

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