Posts Tagged: Rhonda Smith

UC releases new cost study for growing winegrapes in North Coast

A new study on the cost and returns of producing winegrapes in the North Coast region's Russian River Valley, an American Viticulture Area in Sonoma County, has been released by the UC Agricultural Issues Center and the UC Davis Department of Agricultural and Resource Economics.

The cultural practices described represent production operations and materials of a well-managed vineyard in this region. The costs, materials and practices shown in this study will not apply to all farms. The production focuses on two varieties, chardonnay and pinot noir. Growers, UC Cooperative Extension farm advisors and other agricultural associates provided input and reviewed the methods and findings of the study.

The hypothetical vineyard was established with the appropriate permits required by the County of Sonoma at the time it was developed and assumed to lie in the warmer edge of the Russian River Valley. The farm is owned and operated by the grower. The site has less than a 15 percent natural slope. In reality, production is strongly influenced by the vineyard's specific location within the valley and by weather that will significantly impact yield in some years. A vineyard management company is contracted to provide services such as specialized equipment and operators, and laborers for hand operations such as suckering, shoot thinning, tucking, harvesting and pruning.

The authors describe the assumptions used to identify current costs for production of the winegrapes, material inputs, cash and non-cash overhead. Ranging analysis tables show profits over a range of prices and yields for each variety. Other tables show the monthly cash costs, the costs and returns per acre, hourly equipment costs, and the whole farm annual equipment, investment and business overhead costs.

The new study is titled “Sample Costs to Produce Winegrapes, Chardonnay and Pinot noir, North Coast Region Russian River Valley, Sonoma County – 2016.”

Free copies of this study and other sample cost of production studies for many commodities are available. To download the cost studies, visit the UC Davis Department of Agricultural and Resource Economics website at http://coststudies.ucdavis.edu.

The cost and returns program is funded by the UC Agricultural Issues Center, which is part of UC Division of Agriculture and Natural Resources, and the UC Davis Department of Agricultural and Resource Economics.

For additional information or an explanation of the calculations used in the studies, contact the Agricultural Issues Center at (530) 752-4651, Donald Stewart at destewart@ucdavis.edu or Rhonda Smith, UC Cooperative Extension advisor in Sonoma County, at (707) 565-2621 or rhsmith@ucanr.edu.

 

UC study shows promise for protecting coastal winegrapes from frost

In California’s coastal winegrape-growing regions, a spring freeze can be devastating. Tender shoots and leaves burn back, causing damage that reduces the crop yield when it is harvested many months later.

“We’ve had some very severe frosts in San Luis Obispo County and on the Central Coast over the years,” said Mark Battany, UC Cooperative Extension advisor in San Luis Obispo and Santa Barbara counties. “In 2011 we had the most severe frost in 30 years and many millions of dollars of crop and wine value were lost because of that freeze.”

Farmers take various measures to protect their crops when temperatures dip below freezing, such as mowing or tilling the vineyard row middles, or running sprinklers with water pumped from underground aquifers or diverted from streams.

“Sprinkler frost protection is very effective in many areas,” Battany said. “The concern we have in California is that water is becoming more limited. We don’t have the ability to easily import water from other areas to our coastal regions, and our local supplies are being stretched quite thin.”

Some farmers are considering wind machines, which mix warmer air high above the ground with air closer to the ground to raise the temperature. But wind machines are expensive, and the potential effectiveness depends on the strength of the temperature inversion. UC scientists are now gathering data to help inform farmers before making the costly investment.

Battany and his colleagues - Rhonda Smith, UCCE advisor in Sonoma County, Richard Snyder, UCCE specialist in the Department of Land, Air and Water Resources at UC Davis, and Gwen Tindula, UCCE staff research associate - are collecting temperature inversion data at different locations in 60 coastal vineyards throughout three counties to document inversions during frost events.

The scientists installed 35-foot-high meteorological towers with data loggers at the top and at the five-foot height to measure the difference in temperature. In the first year of the study, there were useful inversion conditions on nearly three-fourths of the nights when there was frost.

“That’s a fairly good success rate,” Battany said. “The wind machine will provide quite a bit of protection under those conditions.”

The study will continue this year and in 2014. Farmers who wish to install their own meteorological towers with data loggers can do so at a cost of about $250 each. Installation instructions and specifications are available on the UCCE website.

The UCCE research is funded with a grant from the American Vineyard Foundation and a CDFA Specialty Crops Block Grant.

For more details, see the video below:

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