J.of Soc of Agri Struc, Japan.
Vol.23,No.1 July 1992,7-14
Original:
Language: Japanese

    Atmospheric conditions in a disused rail road tunnel were surveyed, and then several vegetables such as potato(Solanum tuberosum L., cv. Toyoshiro and Norin-ichigo), Chinese yam(Dioscorea opposita Thunb. cv. Nagaimo) and burdock(Arctium Rappa L.) were stored in the tunnel for about three months.
    The results are summarized as follows:
(1) An yearly average temperature was about 7 centigrade at several locations ranging 100m to 500m from the tunnel entrance, and the humidity was kept at about 95%.
(2) Reducing sugar content of potato tubers increased gradually during tunnel storage, while its weight loss was only 1% after 3 months of the storage.
(3) Although the viscosity of Chinese yam tubers slightly increased at a beginning of storage, after that it showed gradual decrease.
(4) When the humidity in a tunnel is kept at 95% or more, it will be effective to store the burdock without polyethylene film.

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