- Author: Jeannette E. Warnert
“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:
- Posted By: Brenda Dawson
- Written by: Pam Kan-Rice, (530) 754-3912, firstname.lastname@example.org and Brenda Dawson, (530) 752-7779, email@example.com
University of California researchers will receive more than $6 million in funding from the U.S. Department of Agriculture’s 2011 Specialty Crop Block Grant program, which is intended to enhance agricultural markets, address environmental concerns, protect plant health, provide farmers with scientifically tested production techniques and increase food safety.
The USDA awarded $55 million nationwide for the Specialty Crop Block Grant program, which provides grants to states to enhance the competitiveness of fruits, vegetables, tree nuts, dried fruits, horticulture and nursery crops.
The California Department of Food and Agriculture identified 72 projects in the state for funding, including 30 projects led by University of California agricultural researchers.
“Funding for specialty crop research is critical to California’s $37.5 billion agricultural industry because many of the crops grown in California are considered specialty crops,” said Barbara Allen-Diaz, UC vice president for agriculture and natural resources. “With these funds, UC scientists will be helping California farmers find new ways to protect their crops from pests and diseases, remain economically viable, and provide healthy food for an increasing number of people.”
- The UC Davis Center for Produce Safety received a combined $1.4 million for food safety projects, many of which will develop strategies to reduce the risk of foodborne illness.
- Assessing temperature conditions to determine the potential for using wind machines as an alternative to sprinklers for frost protection in coastal vineyards with the ultimate goal of reduced water use is the goal of a $59,961 project led by UC Cooperative Extension viticulture advisor Mark Battany in San Luis Obispo County.
- The UC Agricultural Issues Center will be conducting an analysis of the effects of quality control standards and European Union trade policies on the California olive industry, to identify market opportunities as standards and policies change, funded for $135,883.
- The largest single award made to UC in this round was $495,750 to a statewide project that will assess the effects of reduced irrigation on strawberries, blueberries and blackberries -- including berry yield, nutritional content, flavor and consumer preference -- led by researchers with the UC small farm program.
- A project that will train small-scale, Latino, Hmong and Mien growers in Fresno, the Sacramento Valley, the Central Coast and Southern California regions to compete in new markets, led by the UC Sustainable Agriculture Research and Education Program, received $86,851.
- Developing improved integrated pest management strategies that could help ornamental nurseries protect against the light brown apple moth is the goal of a $255,598 project led by Steve Tjosvold, UC Cooperative Extension farm advisor for Santa Cruz County.
“Many of these projects are collaborative efforts between farmers and scientists from UC campuses, UC Cooperative Extension advisors in counties, and other agencies and educational institutions,” Allen-Diaz said. “This array of expertise focused along the spectrum of specialty crops production will help keep California competitive in the global economy.”
For a complete list of California’s Specialty Crop Block Grants projects, please visit http://www.cdfa.ca.gov/grants.