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Written Paper

Effects of ethephon on growth and yield of sweet sorghum  [2013]

Sommart Yoosukyingsataporn(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Agricultural Technology. Department of Plant Production Technology) E-mail:kysommar@kmitl.ac.th Somyot Detpiratmongkol(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Agricultural Technology. Department of Plant Production Technology) Tawatchai Ubolkerd(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Agricultural Technology. Department of Plant Production Technology)

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Aims of this study were to investigate the effects of concentration and application time of ethephon on growth and yield of two sweet sorghum cultivars. Field experiment was conducted at Faculty of Agricultural Technology, King Mongkut's Institute of Technology Ladkrabang, during March to June, 2012. Two sweet sorghum cultivars (KKU 40 and Ethanol 2) four ethephon concentrations (0, 200, 400 and 600 mg/l) and three stages of ethephon application (at 15, 30 and 45 days before harvest (DBH)) were designed in a split-split plot with three replications. Sweet sorghum cultivars assessed as main plot, ethephon concentration as sub plot and hormone application time as sub-sub plots. The results were shown that Ethanol 2 had higher stem height, brix juice extract and stem yield than KKU40. The effect of ethephon concentrations on growth and yield. The lowest was obtained in 600 mg/l and the highest obtained in 0 mg/l. For timing of hormone application, stem growth and yield were lowest at 45 days before harvesting of application time and the highest where was applied at 15 days before harvesting. However, no interaction were found among the sweet sorghum cultivars, ethephon concentrations and stages of hormone application.