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United States Department of Agriculture

Agricultural Research Service

2010 Annual Report

1a.Objectives (from AD-416)
Statistical analyses of 7-year database from Trellis Tension Monitors (TTM) in Washington state and three-year database from TTM installations in California, to determine.
1)spatial distribution needed for yield estimation with TTMs;.
2)accuracy of yield estimation;.
3)accuracy of detecting key grapevine phenological stages from the continuous tension trace; and.
4)accuracy of yield estimation under physically constrained and open-ended TTM systems.

1b.Approach (from AD-416)
Complete field data collection; compute classic univariate descriptors; define linear and nonlinear models; complete geostatistical characterization of yield at research sites; and model yields from dynamic trellis tension values. Documents SCA with BioDataManagement.

3.Progress Report

The raw data collected from 71 trellis tension monitors in Washington and California vineyards were post-processed: anomalous signals were removed from the three- to six-year data records; continuously recorded tension values were corrected for temperature and normalized to pre-budbreak values for each year; atypical shifts in values were offset; a running median filter was applied to remove the effects of environmental transients. Processing was accomplished using a combination of MS-Excel and SAS software. The California dataset was delivered to ARS in this reduced form for subsequent statistical analysis by another cooperator.

ADODR monitoring included lab meetings, e-mail and phone calls.

Last Modified: 6/25/2016
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