Arkansas Glyphosate Tolerant Soybean Offers Higher Yields

   The second University of Arkansas System Division of Agriculture soybean variety based on Roundup Ready® technology offers higher yields and a more upright plant than its predecessor, said soybean breeder Pengyin Chen.
   Chen said UA 5715GT – “GT” stands for glyphosate tolerant – offers the weed control advantages of Roundup Ready® soybeans without the added cost of technology fees. As with UA 5414RR, the division’s first Roundup Ready® soybean, growers can save seed from each harvest for planting the following year.
   UA 5715GT is a late maturity group V soybean that averaged 60.8 bushels per acre in Division of Agriculture soybean performance trials. That’s nearly 3 bushels per acre better than UA 5414RR, Chen said.
   The new soybean has upright plant growth that is taller than UA 5414RR and is highly resistant to lodging and shattering, Chen said. It is also adapted to a broad range of growing conditions across Arkansas
   UA 5715GT is resistant to stem canker and frogeye leaf spot, and moderately resistant to reniform nematodes, Chen said. It is susceptible to southern root-knot nematode and soybean cyst nematode (races 1, 2, 3, and 5), and moderately susceptible to sudden death syndrome.
   Monsanto’s patent on the first generation of Roundup Ready® products expired in 2015, Chen said, and the company shared the breeding material with public breeding programs, including the Arkansas program directed by Chen.
   Chen said UA 5715GT and UA 5414RR fill a niche for growers who want to use the Roundup® system of weed control but don’t want to pay the higher cost of the next generation Roundup Ready 2 Yield® technology.
   The Division of Agriculture’s Foundation Seed Program is selling UA 5715 to licensed seed dealers this year. Chen said the initial offering began with 905 bags of seed, though most of that has been sold.
   Seed growers or dealers can contact Debbie Ahrent at the Division of Agriculture’s Foundation Seed Program for more information about acquiring UA 5715GT. Call Ahrent at 870-672-2661.
   The seed should be widely available to soybean producers in 2017, Chen said. ∆

 Ph.D. student Liliana Florez harvests soybeans by hand from a breeding plot 
 at the Arkansas Agricultural Research and Extension Center in Fayetteville.
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