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Written Paper

Effects of planting dates on stalk yield and agronomic characters of sweet sorghum cv. KKU40  [2007]

Prasit Jaisil(Khon Kaen University, Khon Kaen (Thailand). Faculty of Agriculture. Dept. of Plant Science and Agricultural Resources) Chatchai Apornrat(Khon Kaen University, Khon Kaen (Thailand). Faculty of Agriculture. Dept. of Plant Science and Agricultural Resources) Akom Kidkarn(Khon Kaen University, Khon Kaen (Thailand). Faculty of Agriculture. Dept. of Plant Science and Agricultural Resources)

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Sweet sorghum has been revealed that it had very high potential for using as an additional raw material for commercial ethanol production. Sequencial planting dates of sweet sorghum were carried out in Khon Kaen ie. 1) pilot farm of Khon Kaen Sugar Mill 2) farmers' field in Muang District, Khon Kaen and 3) Khon Kaen University Farm. The Objective was to find out suitable growing season for sweet sorghum under rainfed condition. The trials were conducted from 1 February to 1 October, 2005 with 15 days interval of planting dates. The results from 17 planting dates revealed that days to 50 percent flowering average from 60-73 days, stalk yields average from 5.32 to 8.24 tons/rai, sugar content average from 18 to 21 deg brix, plant height average from 169 to 330 cm., stalk size average from 1.07 to 1.83 cm., seed yield average from 87-262 kg/rai and the relative juice quantity average from 873 to 2928 l/rai. The results also revealed that the early planting in February gave lower yield (5.0 to 5.3 tons/rai) than the planting dates from March to July (6.19 to 8.24 tons/rai). Whereas the late planting from mid July to October tended to reduce yield (3.61 to 6.22 tons/rai). It was concluded that the farmers can grow sweet sorghum from February to August and the suitable growing period are from March to July which will give higher yield than that of growing in February and August. This information can be utilized to ensure continuous supply of raw material with pr
oper planting date sequence.

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Kaen Kaset

ISSN : 0125-0485

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