Submitted to: Kenaf Association International Conference Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: March 1, 1996
Publication Date: N/A
Technical Abstract: Herbicides are now used in the commercial production of kenaf for a range of uses (oil absorbents, potting soil amendment, drilling mud component, animal litters, livestock feed, and speciality papers), but there is no research concerning the presence of herbicide residues within the plant material. The objective of this research was to determine the amount of herbicide residues present in kenaf plant material and the effect of weed competition on kenaf yields. In 1993 and 1994 research was conducted at Lane, Oklahoma using trifluralin and pendimethalin applied as preeemergence herbicides at three rates (0.56, 1.12 and 2.24 kg/ha) with four replications. The research study also included weed-free and weedy check treatments. Data and plant samples were collected at two harvest dates, 75 and 150 days after planting (DAP). Chemical and data analysis determined that trifluralin and pendimethalin were not at detectable levels for any of fthe application rates for either harvest date. Weeds in the weedy check treatment reduced kenaf stalk yields by an average 1783 kg/ha compared to the weed-free treatment. This research demonstrated that trifluralin and pendimethalin when applied at standard rates were not found in kenaf plant materials harvested at 75 or 150 DAP and that without weed control weed competition consistently reduced stalk yields.