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Reports

Pinot noir Crop Estimation Method Allows Growers to Estimate Yields Earlier than Lag Phase

Patricia A. Skinkis, Katherine R. McLaughlin
Catalyst: Discovery into Practice February 2022 6: 30-37; published ahead of print December 17, 2021 ; DOI: 10.5344/catalyst.2021.21005
Patricia A. Skinkis
1Department of Horticulture, Oregon State University;
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  • For correspondence: patricia.skinkis@oregonstate.edu
Katherine R. McLaughlin
2Department of Statistics, Oregon State University.
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    Figure 1

    Heat unit accumulation by Pinot noir phenological stage of development in Dayton, OR. Bloom is defined as 50% capfall, and veraison was defined as the start of color development in at least 5% of berries on 50% of clusters. Heat units are shown as GDD10, or growing degree days with a minimum temperature threshold of 10°C; data were calculated using daily temperatures (T) obtained from a regional weather station (Aurora, OR; ARAO, Agrimet, https://www.usbr.gov/pn/agrimet/) using the equation (Tmax + Tmin)/2 - 10°C.

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    Figure 2

    Mean berry mass measured from post-fruit set to harvest during six growing seasons (2011 to 2016) from a commercial Pinot noir vineyard in Dayton, OR.

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    Figure 3

    Increase factors of Pinot noir clusters, determined by comparing cluster weights during development to final cluster weight at harvest during six growing seasons (2011 to 2016) in a commercial vineyard in Dayton, OR. Relationships of increase factors are shown for A) days post-budbreak (y = 8518472 x-3.26, root mean square error [RMSE] = 0.7142); B) days post-50% capfall (y = 551.61 x-1.45, RMSE = 0.6309); C) growing degree days (GDD) base 10°C post-budbreak (y = 84609124 x-2.66, RMSE = 0.7794); D) GDDs base 10°C post-50% capfall (y = 16216.31 x-1.46, RMSE = 0.6126); E) GDDs base 50°F post-budbreak (y = 402640001 x-2.66, RMSE = 0.7785); and F) GDDs base 50°F post-50% capfall (y = 38007.28 x-1.46, RMSE = 0.6132).

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    Figure 4

    Comparison of cluster weight increase factors using the model increase factor at day count post-50% capfall (y = 551.61 x-1.45) and the actual Pinot noir cluster size increase factor measured in a commercial Pinot noir Pommard vineyard in Newberg, OR during the 2020 growing season.

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Pinot noir Crop Estimation Method Allows Growers to Estimate Yields Earlier than Lag Phase
Patricia A. Skinkis, Katherine R. McLaughlin
Catalyst: Discovery into Practice  February 2022  6: 30-37;  published ahead of print December 17, 2021 ; DOI: 10.5344/catalyst.2021.21005

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Pinot noir Crop Estimation Method Allows Growers to Estimate Yields Earlier than Lag Phase
Patricia A. Skinkis, Katherine R. McLaughlin
Catalyst: Discovery into Practice  February 2022  6: 30-37;  published ahead of print December 17, 2021 ; DOI: 10.5344/catalyst.2021.21005
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