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Wine grape cultivar influence on the performance of models that predict the lower threshold canopy temperature of a water stress index

King, B.A. and Shellie, Krista (2018) Wine grape cultivar influence on the performance of models that predict the lower threshold canopy temperature of a water stress index. Computers and Electronics in Agrculture. 145:122-129. 3 January 2018.

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Abstract

The calculation of a thermal based Crop Water Stress Index (CWSI) requires an estimate of canopy temperature under non-water stressed conditions. The objective of this study was to assess the influence of different wine grape cultivars on the performance of models that predict canopy temperature non-water stressed wine vines. The canopy temperature of the wine grape cultivars Malbec, Syrah, Chardonnay and Cabernet franc were measured under well-watered conditions over multiple years and modeled as a function of climatic parameters solar radiation, air temperature, relative humidity and wind speed using multiple linear regression and neural network modeling. Despite differences among cultivars in non-water stressed canopy temperature, both models provided good prediction results when all cultivars were collectively modeled. All predictive models had an uncertainty of plus or minus 0.1 in calculation of the CWSI despite significantly different prediction error variance between models.

Item Type: Article
NWISRL Publication Number: 1619
Subjects: Irrigation > Irrigation control
Water > Water management
Water
Depositing User: Users 6 not found.
Date Deposited: 18 Jun 2018 22:15
Last Modified: 18 Jun 2018 22:15
Item ID: 1664
URI: https://eprints.nwisrl.ars.usda.gov/id/eprint/1664