Abstract
The establishment of kenaf ( Hibiscus cannabinus L.) as an alternative fiber source for United States requires that an effective weed control strategy be developed. The objective of this research was to determine the effects of metolachlor and trifluralin treatments on kenaf plant development and stalk 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 or metolachlor were applied at rates of 0.56, 1.12 and 2.24 kg ai/ha using fan nozzles at 187 l/ha. The experiments also included a weed-free and a weedy check treatments. Kenaf cultivar ‘Tainung #1’ was planted during June of 1989 and 1990. In each year the experiments were arranged in randomized complete block designs with four replications. There were no visual phytotoxicity symptoms observed for any herbicides. Both herbicides adversely affected plant populations when applied at the 2.24 kg/ha. Trifluralin at 1.12 and 2.24 kg/ha had reduced plant heights compared to plants receiving metolachlor at 2.24 kg/ha. Stalk yields were not significantly reduced as a result of any of the weed control treatments.
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