Suitable harvest times for Kaentawan (Helianthus tuberosus L.) production
2006
Sanun Jogloy(Khon Kaen University, Khon Kaen (Thailand). Faculty of Agriculture. Department of Agronomy) | Ratchanok Mikaew(Khon Kaen University, Khon Kaen (Thailand). Faculty of Agriculture. Department of Agronomy) | Thawan Kesmala(Khon Kaen University, Khon Kaen (Thailand). Faculty of Agriculture. Department of Agronomy) | Wilawan Tula(Khon Kaen University, Khon Kaen (Thailand). Faculty of Agriculture. Department of Agronomy)
Suitable harvest times for kaentawan (Helianthus tuberosus L.) have not been well understood under tropical conditions. The experiment was conducted with the objective of determining suitable harvest times for tuber yield and other agronomic characters. One month-old seedlings were planted during November 2005 to February 2006 under sprinkler irrigation. A randomized complete block design with four replications was used. Three harvest times (75 days after planting (DAP), 90 DAP and 105 DAP) were compared for plant height, stem diameter at ground level, stem diameter at middle stem, soluble solid index (brix) from stem, tuber and root, above ground dry matter per rai, leaf area (LA), leaf area index (LAl), tuber number per plant, tuber fresh weight per rai, tuber dry weight per rai, root dry weight per rai and harvest index (Hl). No significant difference was observed for most characters under study except for root dry weight per rai. Above ground dry matter, LA and LAl, though not significant, trended to decrease at latter harvest times. Soluble solid index, tuber fresh weight, tuber dry weight were unaffected by harvest times. Root dry weight was significantly decreased at latter harvest times, but Hl trended to increase at latter harvest times, but Hl trended to increase at latter harvest times. For short-day planting season, harvest of kaentawan might be carried out as early as 75 DAP to 105 DAP without significant yield loss.
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