Replanting forages after an indaziflam herbicide application
Extension Education
Jennifer Caraway
Miller County Extension Agent
University of Arkansas Division of Agriculture Research and Extension
Texarkana
Abstract
A Miller County producer in Texarkana, AR has an 80-acre field under irrigation used to produce high-end Bermuda horse hay. In late February of 2023 this producer applied a herbicide burndown applying 3oz per acre of indaziflam tank mixed with a 32oz rate of 41% glyphosate. Unfortunately, due to some severe winter kill damage in conjunction with the late herbicide burndown, the producer had significant yield loss nearing 80% in damages. Because of this, the producer chose to do a complete field renovation with a replant.
Noting the label’s 22-month plant back restrictions on cereal crops, root crops, and soybeans, and worried this might impact some of our potential replant options, we conducted a soil sample for nutrient analysis and a soil bioassay by collecting soil from multiple different areas throughout these two fields. Using the soil collected we planted Cheyenne II Bermuda seed for this bioassay and within seven days had germination. After the successful bioassay and with approval of the producer, we conducted a plot trial using seven different species to determine germination success.
The trial was implemented in September of 2023, utilizing cool season forages and the plots were fertilized according to soil test analysis results. The stands were assessed on September 27th for stand occupancy and all species achieved 85% -100% rating.
Due to the success of the other species with 85-100% stand occupancy counts, there was strong evidence that showed the producer he could replant in the spring with success in germination.
In April of 2024 the producer planted a full stand of Texas Tuff Bermudagrass. In May of 2024 a stand occupancy count was conducted with an 82% success rate. Within that same year the producer was able to harvest 1.4 tons of DM acre-1. In 2025 we anticipate approximate yields to be approximately 5 tons DM acre-1.
As a direct result of this trial, the producer was more confident he could re-establish Bermudagrass on this hay meadow and only lost one growing season, instead of the suggested 22 months.
Poster has NOT been presented at any previous NACAA AM/PIC
This poster is being submitted for judging. It will be displayed at the AM/PIC if not selected as a State winner. The abstract will be published in the proceedings.
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Authors: Jennifer Caraway, Kenny Simon
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Caraway, J. Miller County Extension Agent , University of Arkansas, Arkansas, 71854
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Simon, K. Animal Science Instructor, University of Arkansas, Arkansas, 72207