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United States Department of Agriculture

Agricultural Research Service

Title: Weed Competition and Herbicide Uptake in Kenaf (Hibiscus Cannabinus L.)

Author
item Webber, Charles

Submitted to: Weed Science Society of America Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: January 12, 1997
Publication Date: N/A

Technical Abstract: Kenaf is alternative fiber crop produced in the United States. Kenaf plant material is grown for a variety of uses including: oil absorbents, potting soil amendment, drilling mud component, animal bedding, livestock feed, and speciality paper. If kenaf plant material has the potential of entering the human food system through livestock feed or animal bedding, it's important to determine if herbicides are present in kenaf plant material. There is little or no research concerning the presence of herbicide residues within kenaf plant material. The objectives of this research were to determine if herbicide residues were present in kenaf plant material, determine the effect of two herbicides on kenaf yield parameters, and determine the effect of weed competition on kenaf yields. A two-year field study was conducted at Lane, Oklahoma on a Bernow fine sandy loam, 0 - 3% slope, (fine-loamy, siliceous, thermic Glossic Paleudalf). Trifluralin and dpendimethalin were applied as preemergence herbicides at three rates (0.56 1.12 and 2.24 kg ai/ha) using flat fan nozzles calibrated to deliver 187 l/ha. The experiments also included a weed-free and a weedy-check treatment. Kenaf cultivar 'Tainung #2' was planted during May of 1993 and 1994. Data and plant samples were collected at two harvest dates, 75 and 150 days after planting. There were no visual phytotoxicity symptoms observed for either herbicide. Chemical and data analyses determined that trifluralin and pendimethalin were not present in kenaf at detectable levels for any of the application rates for either harvest date. Weeds in the weedy-check treatment reduced kenaf stalk yields at 75 DAP by an average 1.8 t/ha compared to the weed-free treatment.

Last Modified: 4/16/2014
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