蔬菜水耕栽培の実用化に関する研究-1-夏期の高温が生育に及ぼす影響

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  • 蔬菜水耕栽培の実用化に関する研究 I : 夏期の高温が生育に及ぼす影響(農学部門)
  • ソサイ スイコウ サイバイ ノ ジツヨウカ ニ カンスル ケンキュウ 1 カキ ノ コウオン ガ セイイク ニ オヨボス エイキョウ
  • Studies on production of vegetable crops in water culture I : Effect of summer heat (Agriculture)

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Water culture which is becoming an important part of vegetable growing in Japan is bound to be practised under plastic-or glass-cover, and therefore, can produce severe heat injury during summer seasons. This report deals with studies on temperature changes inside and out of the culture bed under summer heat, means of maintaining proper root temperature, and effect of high root temperature on the growth of several vegetables. Under a conditoin of summer heat, temperature at surface of the bed was as high as 55℃, whereas, that inside the bed was in the vicinity of 30℃, the maximum being 36℃. Uses of foamed polystyrene plate and black cheese cloth aided in lowering the root temperature. In a bed intermittently supplied with culture solution, the inside temperature fluctuated to a considerable degree with the flow of solution. In a bed where solution was filled to a constant level and renewed partially and periodically, however, the change was very slow. Respiration of cucumber roots was decreased to a considerable degree after objecting them to high temperatures above 40℃ for five hours. Root temperature as high as 28℃ did not inhibit nutrient absorption by tomato seedlings, but rather produced stouter plants, as compared to those grown at 22℃. Shading for a purpose of lowering the root temperature, at the same time, limits the amount of light reaching plants. Sixty-five or 70 per cent of incident light was required in order for radish and two Japanese pot herbs, Chrysanthemum coronarium Linn. and Cryptotaenia japonica Hassk. to grow normally.

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