Ladderless peach and nectarine orchards explored
August 8, 2014
Can shorter peach and nectarine trees reduce labor costs without sacrificing fruit quality and yield?
The answer may be developing soon at a 4-acre test orchard south of Fresno, where University of California researchers are planting semi-dwarfing rootstocks as part of a large, integrated experiment on virtually every aspect of peach and nectarine production.
“We’re designing ‘ladderless’ orchards, which have the potential to cut labor costs by 50 percent or more and improve worker safety,” said UC Cooperative Extension specialist Ted DeJong, a plant physiology professor at UC Davis. DeJong and Kevin Day, a Cooperative Extension farm advisor in Tulare County, are leading the unprecedented experiment.
Conventional peach and nectarine trees grow about 13 feet tall. Setting up, climbing and moving ladders to prune the trees and harvest fruit consumes about half the workday. Ladders are dangerous, too, which is why peach and nectarine growers pay about 40 percent more for workers’ compensation insurance than growers who work with more low-lying commodities, like grapes.
Developed by breeders at UC Davis, the new rootstocks will produce trees that grow about 7 or 8 feet tall and can be pruned and harvested from the ground. With the right orchard management — which Day and DeJong will test at their plots at the UC Kearney Agricultural Research and Extension Center, near Fresno — the shorter trees could produce just as much high-quality fruit as their lofty kin.
“Ladderless orchards would be huge for our industry,” said Bill Chandler, who grows several varieties of peaches and nectarines on his 250-acre Chandler Farms in Selma, California. “There are so many costs associated with ladders that many growers are switching over to almonds just to stay in business. It costs me $1,400 an acre to thin our trees.”
Rod Milton, a fourth-generation stone-fruit grower, said he would welcome a ladderless system for the peaches and nectarines he grows in Reedley, California.
“Even with conventional rootstocks, I prune my trees so workers can take two fewer steps on the ladder come harvest time,” he said. “And the savings are huge, even with that. It’s important to keep farm work safe. And it’s important to keep farming viable, or else we’ll be getting all our produce from overseas.”
Shorter trees are just one of the elements of DeJong’s and Day’s experiment, which explores best practices for keeping peach and nectarine production economically and environmentally sustainable. Funded by the UC division of Agriculture and Natural Resources, their model orchard will integrate virtually every UC pomology advancement in the past 30 years.
The team will plant conventional, tall trees in one plot and cultivate them using standard irrigation, fertilization and pruning practices. On three other plots, they will grow shorter trees with new, “best-management” practices such as minimal pruning, using pressure chambers to measure a tree’s water needs, and applying compost and nitrogen sprays to minimize nutrient leaching and groundwater contamination. They will compare fruit size and yields, canopy light interception, water and nitrate leaching, and more. Graduate students will have opportunities to get hands-on experience as the next generation of stone-fruit experts.
“We’re excited to take our experiments to the next level, to provide growers what they need to make good management decisions,” Day said.
Growers are excited, too.
“If it wasn’t for people like Ted DeJong and Kevin Day, I’m not sure there’d be any of us peach and nectarine growers left,” Chandler said. “They work so hard to make farming efficient.”
The team will begin planting in spring 2015 and should have preliminary data by 2016.
UC Davis is growing California
At UC Davis, we and our partners are nourishing our state with food, economic activity and better health, playing a key part in the state’s role as the top national agricultural producer for more than 50 years. UC Davis is participating in UC’s Global Food Initiative launched by UC President Janet Napolitano, harnessing the collective power of UC to help feed the world and steer it on the path to sustainability.
About UC Davis
UC Davis is a global community of individuals united to better humanity and our natural world while seeking solutions to some of our most pressing challenges. Located near the California state capital, UC Davis has more than 34,000 students, and the full-time equivalent of 4,100 faculty and other academics and 17,400 staff. The campus has an annual research budget of over $750 million, a comprehensive health system and about two dozen specialized research centers. The university offers interdisciplinary graduate study and 99 undergraduate majors in four colleges and six professional schools.
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- Diane Nelson, UC Davis College of Agricultural and Environmental Sciences, (530) 752-1969, firstname.lastname@example.org
- Ted DeJong, UC Davis Department of Plant Sciences, (530) 752-1843, email@example.com
- Kevin Day, UC Cooperative Extension, Tulare County, (559) 684-3311, firstname.lastname@example.org
- Pat Bailey, UC Davis News Service, (530) 752-9843, email@example.com
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