Backyard Orchard News
UC researchers are experimenting with a variety of methods that will help farmers reduce the cost of fruit thinning. Peach, nectarine, plum and apple trees typically set a tremendous amount of fruit. The fruit must be thinned considerably to ensure adequate fruit size.
Since employing farmworkers for hand thinning is a major expense for farmers, researchers have been looking for a mechanical alternative.
One such machine being tested this spring is a “drum shaker,” which was recently shipped to the Kearney Agricultural Research and Extension Center from the USDA Agricultural Research Service’s Appalachian Fruit Research Station in West Virginia.
“We took the drum shaker out to several orchards,” said UC staff research associate Becky Phene, who works in collaboration with UC pomology specialist Scott Johnson. “In four locations, we tagged and labeled shoots, then ran the drum shaker through those rows.”
The researchers counted the fruit on the shoots before and after the drum shaker treatment.
“Our findings show a modest removal of fruit at 350 to 400 rpm,” Phene said.
The experiments have shown that a number of factors come into play when using the mechanical thinning device, such as tree structure, age and fruit size.
“The larger, sturdier scaffolds are harder to shake and suffer more shoot damage or shoot removal,” she said. “The younger, more flexible scaffolds appear more capable of reverberating the energy out to more shoots and shake off more fruit. Also, larger fruit tend to have a better removal rate.”
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“We think the flavor of mandarins declines much more rapidly than oranges,” said Sue Collin, a UC Riverside staff research associate who is based at the UC Kearney Agricultural Research and Extension Center in Parlier.
The way oranges are set out at the grocery store or on home counter tops could be trouble for the more delicate mandarin. And when mandarins make a six-week sea voyage to the Pacific Rim, will Asian consumers find the fruit acceptable?
In order to provide farmers, shippers and retailers accurate information about the impact of different storage temperatures on the quality of the fruit, Collin is working with UC Riverside sub-tropical horticulturalist Mary Lu Arpaia and USDA plant physiologist Dave Obenland to understand the changes in mandarins stored at a variety of temperatures, at different humidity levels, for various periods of time.
“A grocery store may be holding fruit at room temperature, 68 degrees or even warmer,” Collin said. “We’re comparing fruit that has been stored in very controlled atmospheres – at temperatures in the 40s, 50s and 60s.”
When it comes to understanding the acceptability of fresh fruit, nothing can match the human palette.
Collin recruits staff based at Kearney to take a break from their jobs to come to a laboratory built at the agricultural research station specifically for sensory testing. The 1,100-square-foot laboratory features neutral white paint and broad-spectrum lighting. The ventilation system was designed to minimize distracting odors. Inside, six tasting booths each have small windows that open to the kitchen area, where samples are prepared.
“We do quite a bit of testing to see if our volunteers can tell the difference in fruit stored at different temperatures,” Collin said.
In conjunction with the human testing, Obenland studies the fruit’s chemical composition to find out if objective numerical values correlate with the more subjective findings of the human tasters.
Although the optimal storage temperature for mandarins is still under investigation, Collin suggested consumers should keep their mandarins in the refrigerator at home for best results.
“I think the flavor holds better and the fruit lasts longer in the refrigerator,” Collin said.
This research is being funded in part by the Citrus Research Board.
“We’re looking for vegetables that are not on everyone’s radar yet,” explained Mark Gaskell, farm advisor. “In some cases, a new crop is one that’s been grown by another culture for hundreds of years and is just ‘new’ to us.”
The program’s five farm advisors will be testing varieties of rainbow carrots, watermelon radishes, party cauliflower and Romanesco broccoli. The crops are grown in a demonstration plot at the Kearney Agricultural Research and Extension Center, as well as plots in Santa Clara, San Luis Obispo, Tulare and San Diego counties.
“This is another opportunity to highlight specialty crops that could be profitable for small-scale growers, with the tastes and interests of kids in mind,” said Shermain Hardesty, program director and Cooperative Extension economist at UC Davis.
Five schools, which each received a $20,000 “Love Your Veggies” grant from Hidden Valley Salad Dressing, will also be planting and growing the vegetables. The schools and the farm advisors will share their gardening and tasting experiences via blog posts, time-lapse photography in the garden, taste-testing activities and promotion of the program within their networks and local communities.
Now in its fifth consecutive year, the Love Your Veggies program is also providing $100,000 in funding to support the UC Small Farm Program as it identifies and grows these vegetable varieties.
Hidden Valley created the Love Your Veggies program in 2007 after a study conducted by UC Cooperative Extension researchers found that children in the study consumed more vegetables when paired with a moderate amount of ranch dressing.
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