Good Fruit Grower

February 2013

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into the posts and are secured with a setscrew. Curved tubular steel slides over the ends of the antlers, and a setscrew connects the Vs or Ys together for more support. "It's like putting a simple Tinkertoy together," he said. photo by geraldine warner New materials Oliver's motivation for trying new trellis materials stemmed from the need to build a trellis for Olsen Brothers's sweet cherry orchard that's been planted to the new UFO (Upright Fruiting Offshoots) system. The UFO, developed by Washington State University's Dr. Matt Whiting, is part of an effort to develop an orchard system for the future that will be adaptable to mechanical harvest, thinning, and pruning. Olsen Brothers is a growercooperator in the research. "We needed to put in a Y trellis for the UFO cherries," Oliver said, adding that their previous V trellis was made of wood. Olsen Brothers also grows hops, so long wood posts are plentiful. "We haven't built very many of these and don't have the trellis experience of growers like Auvil Fruit Company who have been doing it a long time and have perfected it," he said. "We were looking for something that would be easier to put up and still be strong." He's watched neighboring farmers install V trellis systems and said it looks very hard to do. "I've seen plenty of mistakes and errors made by other growers in their V trellis construction." Trellis installation in rocky ground is also very difficult and can be expensive, he noted. Oliver said that with V trellis systems, a protractor has to be used just right and everything lined up square to get the proper angles. "I've seen welders perched on top of forklifts out in the middle of the orchard, welding all the steel in place." An example of a traditional V trellis with horizontal supports to help keep the trellis together. Easy installation Don't Bu for on y a Tracto r e a trac use. Buy tor wi th multip applic le use ations For the Y trellis they installed in the UFO cherries, a four-foot post was pounded two feet into the ground, allowing the post to stick two feet above the ground. The antlers of the Y were attached to the post two feet off the ground, which is the same height as the horizontally trained cordon of the UFO cherry tree. The system went in so well for the cherries that Oliver decided to try it on a new 40-acre apple block. The main difference in the apple block is that the posts are shorter—three feet instead of four. They are pounded in to leave only six inches of post above the ground. So when the antlers are attached, it becomes a V shape instead of a Y. Some of the newer apple strains and varieties need better light interception to develop optimum color, he explained, which was his motivation for using the V trellis in apples. $64 million question Because the tubular hoop house material has never been tried in a tree fruit trellis before—at least to Oliver's knowledge—the big unknown is the structure's strength. "Being stronger is the plan," he said. "Hopefully, we won't see the trellis going down." Oliver discussed material and structure strength at length with a steel manufacturer before deciding to try the design, but there's always an unknown when trying something new. "We believe it will be stronger, and there will be less of a chance for the tubular supports to buckle or crack like the flat steel commonly used," he said. "But we won't know for sure until we have fruit on the trees." Tim Welsh, horticulturist for Columbia Fruit Packers of Wenatchee, Washington, also has plans to install a tubularstyle trellis this year in an apple block. • NH T1520 (standard) T1520 LP* MODIFIED 39" high* 51" wide $SAfVcE$cy, fi ien Great e lower el cost, e less fu pric urchase p • Low profile • Fuel efficient • 0% interest • 1,635-pound threepoint lift capacity • Reliable 30- or 35-HP engine *at top of fender "Serving Area Farmers Since 1939" 1308 East Mead YAKIMA, WA 509-457-8105 "Your Ag Equipment Specialist" 800-827-5138 QUALITY SERVICE QUALITY PARTS T1520 LP & T1510 LP Developed exclusively by Burrows Tractor • Excellent maneuverability • Great Weed Sprayer 927 Wenatchee Ave • 3 pt Pack Fork handles WENATCHEE, WA full bin of fruit 509-888-0355 Dual Purpose Tractor Accepts Burrows Custom Built Pruning Platform GOOD FRUIT GROWER FEBRUARY 1, 2013 31

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