Assignament 1- Client’s Vineyard Assignment

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University of California, Davis *

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003

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Geography

Date

Dec 6, 2023

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docx

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1

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Client’s Vineyard Assignment The client’s vineyard is located in the Sonoma Valley, Carneros AVA. The region is moderately cool and windy due to the marine fog and breezes coming from the San Pablo Bay, located north 1 . This is the coolest and windiest AVA in both Napa and Sonoma. The soil is predominately clay called Haire-Coombs, this claypan prevents deep rooting. Irrigation is necessary during summer the clay will hold water into spring. This has a cooling effect on the vines and tends to delay bud break. 2 Elevations of most vineyards range from 213m 3 to near sea level closer to the bay. Afternoon breezes coming off the bay are cool and strong. Day time temperatures rarely go over 80F and gets 18- 27in of rain in a typical year. Between 4-5in of rain come during the growing season (during spring) 4 The growing degree days for Carneros AVA considering data from 2022 from Western Weather Group for Carneros Lower Ranch (Ranch 81) 5 is as follows: April 1 st – 8 September 27 th – 2,515 October 31 st – 2,848 2022 data allows us to categorize it under region 2 6 GDD’s data from 2023 for Carneros Lower Ranch (Ranch 81) is as follows: April 1 st -4.3 September 27 th -12.2 Considering GDD’s 2023 information there might be frost damage because of the low temperatures during growing season. The damage is to the active green tissue on the grapevines, mainly young shoots, and emerging clusters. 7 If temperatures keep been low for the winter season there might be a potential for injury to dormant buds and permanent structures of the vine (trunks, graft union, dormant canes). These temperatures can kill or damage susceptible tissue in the vine. 8 1 Napa Valley Vinters (2023, September 28). Los Carneros AVA. https://napavintners.com/napa_valley/los-carneros- ava/ 2 Carneros Wine Alliance (2023, September 28). Our Appellation. https://www.carneros.com/appellation 3 Carneros Wine Alliance (2023, September 28). Technical Information. https://www.carneros.com/technical-info 4 Carneros Wine Alliance (2023, September 28). Our Appellation. https://www.carneros.com/appellation 5Western Weather Group (2023, September 28). Napa Valley Vinters 2022 GDD Napa. https://napa.westernweathergroup.com/report/d221ab3fa21a425bb27a271e4831a5cb?returnUrl= %2Fda22ed4f0777412ebc23e73c544df9ea 6 Lowe K., 2023, Viticulture For Winemakers, Lesion 1.4 Climate and Viticulture Part 1, slide 5. 7 Lowe K., 2023, Viticulture For Winemakers, Lesion 1.4 Climate and Viticulture Part 1, slide 11. 8 Lowe K., 2023, Viticulture For Winemakers, Lesion 1.4 Climate and Viticulture Part 1, slide 11-12.
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