Onion bulb quality at three locations in Thailand
1995
Bufler, Gebhard | Thaworn Kowithayakorn (Khon Kaen Univ., Khon Kaen, (Thailand). Faculty of Agriculture. Dept. of Horticulture)
Bulbs of 17 short-day onion cv grown in 1990 at two locations in northern Thailand (San Pa Tong and Fang) were analysed for percent soluble solids, sugar content (reducing sugars and sucrose) and skin quality (skin covering and skin thickness). Sugar content and percent soluble solids varied between cv grown in San Pa Tong or Fang. At both locations percent soluble solids of the cv were significantly correlated with the content of sucrose, but not with the content of reducing sugars. Skin thickness also varied between cv; in San Pa Tong, for example, it ranged from approximately 0.04 mm to 0.06 mm. Skin thickness of cv was significantly greater in San Pa Tong than in Fang, whereas percent soluble solids were significantly higher in Fang. A significant positive correlation between skin thickness and percent soluble solids was observed in Fang but not in San Pa Tong. In a similar study in 1991 with bulbs of 6 cv grown in Khon Kaen (northeastern Thailand) and San Pa Tong, again a strong effect of cv and location on skin thickness and percent soluble solids was observed. Pungency, measured by pyruvic acid development, and storability of these cv seem also the be affected by the location.
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