水耕栽培キュウリの溶存酸素濃度を異にする培地への活性炭添加が植物体の生育と収穫果実数に及ぼす効果

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異なる溶存酸素濃度下で栽培された水耕キュウリの生育および収穫果実数に及ぼす活性炭添加の効果について検討した.1. 6および24時間通気区の溶存酸素濃度は, 1.7∿3.1 ppm, 5.0∿7.5 ppmでそれぞれ推移し, 活性炭添加の有無による差はほとんどみられなかった.2. 実験終了時の側枝長および側枝の乾物重は24時間通気区よりも6時間通気区がやや抑制された.この傾向は, 活性炭添加によって変わらなかった.3. 株当たりの収穫果実数は通気時間による差はなく, 活性炭の添加により通気量には関係なく有意に増加した.

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The effects of adding activated charcoal and different concentrations of dissolved oxygen to the hydroponic culture solution on the vegetative growth and yield of cucmber plants were studied. 1. The concentrations of dissolved oxygen in the culture solution after 6- and 24- hr aeration treatment were 1.7∿3.1 ppm and 5.0∿7.5 ppm, respectively. Adding activated charcoal to the culture solution with different aeration periods did not affect the concentrations of dissolved oxygen. 2. Whether the activated charcoal was added or not, the length of the primary lateral branch and its dry weight at the end of the experiment decreased slightly following 6-hr aeration compared to that following 24-hr aeration. 3. The yield per plant was unaffected by a 6-hr or 24-hr aeration but it was significantly increased by the addition of activated charcoal. Apparently root exudates, which are detrimental to vegetative growth and yield of cucumber plants are adsorbed by the activated charcoal.