Irrigation techniques for the production of tomato furuits with high sugar content in a tomato cultivar, Koshino-ruby, grown in isolated culture
1996
Sato, N. | Tanaka, H. | taki, S.
A tomato cultivar, Koshino-ruby was bred recently in Fukui Prefecture and it produces many fruits with amedium size and high sugar content. This experiment was conducted to establish irrigation techniques in order to enable this cultivar to bring forth its fruits with sugar content higher than 8%. 1. When irrigation was started at the point when soil pF reached to 2.3 or 2.7 in spring cultivation (February 5,1992-July 15,1992), the sugar content in tomato fruits increased, but the weight of each fruit decreased drastically, resulting in agreat loss in commercial values. It was considered from this result that the irrigation should be restricted from the flowering stage of the sixth fruit truss and should be started at soil pF lower than 2.3. 2. When the irrigation was started at soil pF 2.1 in autumn cultivation (July 3, 1992-November 24, 1992), the fruits with sugar content higher than 8% and weight of each fruit at about 35g could be harvested continuously from 60 days after the irrigation was restricted, although no fruit with high sugar content was obtained during earlier stages than this stage. This result suggested that the high and stable production of fruits with sugar content higher than 8% may be realized if the irrigation is and stable production of fruits with sugar content higher than 8% may be realized if the irrigation is restricted from earlier growth stages and the starting point of irrigation is set at about soil pF2.0 during later growth stages.
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