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This study was carried out to investigate effects of spring and fall cultivation on fruit growth and sugar accumulation of five muskmelon cultivars maintained by seed company. Fruit weight of ´Ase´ , ´Sugar´ and ´S.R´ was around 800g, and ´Roan´ and ´Ans´ were 1,200g. Fresh weight of fruit was heavier in the spring cultivation than in the fall cultivation until 40 days after anthesis, but a little decreased 50 days after anthesis. These suggested that temperature and light intensity were closely concerned with fruit growth. Sugars found were sucrose, glucose and fructose. Sucrose content was the highest (65-80%) among sugars, even though there was a little difference in each cultivar. Sugar accumulation rapidly increased 20 days after anthesis but slowly decreased 50 days after anthesis. According to the soluble solid content and total sugar content, ´Ase´ , ´Sugar´ and ´S.R´ were classified as high sugar muskmelons, and ´Roan and ´Ans´ were as low sugar muskmelons. High sugar muskmelon that showed higher sugar in the spring cultivation than in the fall cultivation were considered invaluble as breeding sources to increase sugar content in warm season.
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