The Department of Agriculture produces the high-yielding rice variety Clearfield through Horizon Ag

CLL18, a new high-yielding rice variety Clearfield®, developed by Arkansas Agricultural Experiment Station, will be available to rice producers from Horizon Ag in 2023.

Quick facts

  • Arkansas Agricultural Experiment Station produces high-yielding Clearfield® diversity
  • CLL18 yielded 221 bushels per hectare in rice performance tests in Arkansas
  • The seeds will be available from BASF Agricultural Solutions through Horizon Ag in 2023

New High Yield, Clearfield® a rice variety developed by Arkansas Agricultural Experiment Station will be available to rice producers from Horizon Ag in 2023.

CLEARFIELD RICE – CLL18, a new variety of Clearfield with long grains, goes to a research site at the Center for Rice Research and Expansion near Stuttgart. The mark identifies the selection designation of the variety before the Arkansas Agricultural Experimental Station released it in 2022. (Photo U of A System Division of Agriculture, Christian DeGuzman)

The new rice is called CLL18 and averaged 221 bushels per acre over two years in Arkansas Rice Performance Tests in 2020-21 conducted by the University of Arkansas Department of Agriculture.

Starting in 2022, the ARPT will be called the Arkansas Rice Variety Advanced Trials.

“It was the most high-yielding non-hybrid Clearfield® rice at ARPT during those two years, ”said Karen Moldenhauer, Honored Professor and Rice Breeder at the experimental station. “She looked very good in all the trials she went through.

“CLL18 is an excellent Longfield® long-grain line, derived from the intersection of Roy J and CL142-AR, manufactured at the Rice Research and Expansion Center in Stuttgart in 2011,” said Moldenhauer.

BASF has provided the CL142-AR Clearfield® breeding material.

“It has an excellent crop of coarse rice,” Moldenhower said. “CLL18 yielded an average of 221 bushels per hectare in two years in the ARPT 2020-21, compared to CLL16 at 210 bushels per acre and Diamond at 209 bushels per acre,” she said.

“BASF views the CLL18 as a high-performance new Clearfield® a variety that will benefit rice growers in Arkansas as well as rice growers from the mid-south to the coastal states, ”said Frank Hardiman, rice licensing manager at BASF Agricultural Solutions. “The new CLL18 will be a great addition to the portfolio of herbicide-resistant rice varieties, Horizon Ag. CLL18 will be a great companion for CLL16, this combination of widely adapted varieties will have high performance in the southern region ”.

“We appreciate the rice breeding efforts of the University of Arkansas’s Department of Agriculture, which developed CLL18, and the business relationship we have with Horizon Ag that will bring CLL18 to market in 2023,” Hardiman said.

Tim Walker, general manager of Horizon Ag, said: “We are thrilled with what the new CLL18 will have in our elite Clearfield® a portfolio of rice varieties and the excellent productivity potential it offers to our farmers. CLL18 has shown that it has a yield potential equal to or greater than CLL16, which has proven that it can yield crops with the most efficient varieties and even hybrids. Also, because CLL18 has matured earlier than CLL16, and seems to be well adapted to the coastal regions of Louisiana and Texas, it may be better suited to second-harvest situations. ”

CLL18 will be in seed production in 2022, Walker said. He encourages farmers to look at how he works and where he will fit on their farms, along with other Horizon Ag Clearfield® performers such as CLL16, CLL15 and CLL17.

“CLL18 is another step in our commitment to providing farmers with better and more productive varieties,” Walker said. “Because he doesn’t have the pi-ta gene, he doesn’t have as wide a range of explosions as CLL16. But it will be a great addition to the magnificent Clearfield® varieties that help farmers improve production capacity and profitability ”.

Moldenhauer said CLL18 has a plant height of 37 inches with a grain weight and core size like Diamond, and an early ripening period similar to CLL15. It has a resistance to deposition similar to Diamond and CLL16.

“CLL18 is moderately susceptible to the usual rice blast, bacterial cave and false shin,” Moldenhauer said. “It is moderately resistant to narrow brown leaf spot.”

According to her, CLL18 has a typical South American quality of long-grain cooking.

“I would like to thank the Arkansas Rice Research and Promotion Council,” Moldenhauer said. “His support for the breeding program has made it possible to develop CLL18 and many of our other rice varieties.”

Clearfield® rice, from which CLL18 was derived, was developed at the University of Louisiana based on a selection line of rice with a natural genetic mutation tolerant to the imidazoline herbicide family.

LSU scientists have licensed the original Clearfield® lines to American Cyanamid, now BASF Agricultural Solutions, which later shared breeding material with the Department of Agriculture of the University of Arkansas. Horizon Ag is a seed company licensed by BASF to sell Clearfield® rice varieties.

Seed breeders for CLL18 will be stored at the Rice Research and Expansion Center of the Agriculture Department and distributed to Horizon Ag producers.

Fertilizers and other agricultural management advice are available from county or Horizon Ag offices.

Fred Miller is a program specialist at the University of Arkansas in the Department of Agricultural Communication Services. You can contact him at: The Department of Agriculture produces the high-yielding rice variety Clearfield through Horizon Ag

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