We examined the influence of nutrient solution and N concentration in hydroponics by spraying the root growth of 1-year-old trees of 'Kyoho' grapes. The results demonstrated that the growth and quantity of the new root were the highest at EC 0.5 mS/cm nutrient solution. Influence of N concentration (the same rate of N types; NO3-N : NH4-N =2:1) on the quantity of the new root was not marked, however, a higher concentration, 20ppm, slightly increased the quality compared to 10ppm. " Twice-a-year

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... harvesting" culture("first crop" : sprouted on Jan. 17th. and ripened on May 30 th, "2nd crop" : sprouted on July 10 th and ripened on Oct. 30 th.) of 3-year-old 'Kyoho' was performed by this cultural system. As for the N concentration in the nutrient solution,the largest amount of shoot and berry growth was found at 20 ppm, and the least amount of shoot