Location: Water Management Research
2011 Annual Report
1)Control – current vineyard practice (>100% evatranspiration (ET)),.
3)85% ET and,.
4)70% ET. These irrigation deficits would be induced from bloom to veraison. Prior to this treatment period and post treatment irrigation would be set based on the grower’s current practices. For the Cabernet Sauvignon grape block the treatments are as follows;.
1)Control – current vineyard practice (extreme deficit, about 50% ET all season),.
2)1/3 increase in irrigation all season,.
3)1/3 increase in irrigation until fruit set, stop, then a 1/3 increase again at veraison, and.
4)a 1/3 increase at 50% veraison. Within each vineyard, there were four replicate blocks containing each treatment, one through four, in a randomized block design. This was done to ensure that any differences in soil and microclimate characteristics were minimized. The soil on both sites is mapped as a Warden silt loam. Once the sites were determined and treatment plots marked, the irrigation system was modified to provide for the treatments in both grape varieties. Neutron probe access tubes were inserted between the 2nd and 8th data vines in each plot. Additionally, four watermark soil moisture sensors were place in each vineyard, one per treatment, to have a consistent form of measurement between all of the vineyards in the study. Paso Panels for measuring the shaded area under the grapevine canopy were constructed and other equipment (leaf pressure bomb) was purchased. Monitoring will begin at bloom, which currently is 3 weeks late in central Washington due to cold weather. The lead scientitst monitors the operation of the project through email exchanges, conference calls and annual progress reports and yearly project team meetings.