Fermentation Batch Review (steps 3-17)
To review each Fermentation Batch, we designed a layout which pulls all berry tests and fermentation actions data together. The goal is to provide a context to explain the actions taken and the results achieved in a uniform format across all fermentations all vintages. The “REVIEW: Fermentation Batch” layout has 7 tabs:
MUF Calibration: is used to review the calibration and adjustments made to the OenoFoss “Must-Under-Fermentation” measurements
Phenolics: is used to correct the results from WineXRay’s phenolic component estimates which tend to show aberrations due to sampling errors in the spectral analysis
Acidity: is used to review the different measurements of acidity and comment on the effect of acidity adjustments
Actions: is used to review and comment on all actions taken during fermentation
Fermentation: is used to review and comment on the progress of the fermentation
Source Detail: is used to review and comment on the quality of harvest blocks which made up a fermentation batch
Overview: sums up all the commentaries and data in the previous 6 tabs.
In the following paragraphs, we show the screenshots for each tab using the actual data for the 2017CSLR1 fermentation batch
MUF Calibration tab
This tab shows the OenoFoss measurements of the chemical properties and the adjusted values. An adjustment has to be made to the raw “MUF / MustUnderFermentation”-measurement because OenoFoss only provides calibrated measurements for “Must” and for “Finished Wine”. Note, we need to input the boundary conditions (yellow fields) in this table for the adjustments to happen. An explanation of how the adjustment is calculated can be found in the Laboratory section.
The Phenolics tab reviews the phenolic results provided by WineXray based on the measured spectrum of each sample. Impurities occasionally distort the measured spectra in the sample. As a consequence, the phenolic results are distorted. We use this layout to make manual adjustments to the phenolic results by inspecting the graphs and eliminating outliers. Again, we input the yellow fields during the review to summarise the results.
The Acidity tab shows the evolution of the OenoFoss-based measurements of pH, TA, VA, Tartaric Acid, Gluconic Acid and Malic Acid, and the timing of the Tartaric Acid additions, if any. Note, the table shows the adjusted values described in the MUF-Calibration tab. We complete the yellow fields during the review to summarise the results.
The Actions tab reviews the actions taken during winemaking. The steps include saignee, additions of water, enzymes, yeasts, nutrition, sulfur, oxygen, tartaric acid oak chips and the removal of skins and seeds in pressing. This tab allows reconciling the batch weights throughout all steps. Again, we enter summary data in the yellow fields during the review process.
The Fermentations tab reviews the progress of the fermentation in terms of fermentation step and conversion of sugars to alcohol as measured by completion %, Brix, density, glucose, fructose and alcohol. This tab also lists all the action comments. Again, we enter summary data in the yellow fields during the review process.
Source Detail tab
This tab shows the berry test results of the components making up the fermentation batch. In this instance, the 2017CSLR1 batch consisted of only one component, grapes from the CSLR block. In other instances, we would see multiple rows of graphs in this layout – one for each component.
The Overview tab pulls together all the information added in the yellow fields in the previously discussed tabs. The goal of the fermentation batch review is the write a Batch Commentary which summarises all the information collected.
Tracking Results for 2018
Currently, the “REVIEW: Vintage” layout provides the best overview of what we did with the 2018 vintage. We described it already in the Winery Overview page. Note, in 2018 we started tracking manhours spent in the vineyard, winery and cellar. So for each step and batch, we can now show cumulative manhours spent.
If we want to drill down more into what happened in the vineyard during 2018, we look at the “REVIEW: Weather and Berry Maturation” layout
The first tab shows the weather conditions during the year and the evolution of sugar accumulation (Brix) and acidity (pH) during the final weeks of berry maturation for each of the 5 blocks. The second tab shows more details on berry maturation. Overall, the weather conditions throughout the season were favourable, a bit cool but no heat spikes. Consequently, the harvests were good, both in terms of volume and quality.
The following screenshots show the Overview tab of the “REVIEW: Fermentation Batch” layout for each of the 4 fermentations, all indigenous.
We first harvested the Merlot and CabFranc blocks and fermented in 2 tanks which we combined into single settlement tank.
Then we harvested the Cabernet Sauvignon blocks and fermented both in a single large tank
Finally, we harvested the small Petit Verdot block and fermented in a small tank
On completion of all fermentations, we allocated the young wine from the 3 settlement tanks into 3 oak barrels at different Cabernet Sauvignon – Merlot – Cabernet Franc – Petit Verdot combinations and we saved topup wine in small topup tanks dedicated to each barrel.