蔬菜の根の生理に関する研究(第5報) : 水耕栽培における通気が蔬菜類の生育並びに養分吸収に及ぼす影響について

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1. To investigate the effects of aeration on the growth and uptake of nutrients of vegetable crops, extensive studies were carried out in the nutrient solutions, in which the amount of dissolved oxygen was regulated in three grades as follows: (1) Solution aerated continuously by bubbling air (2) Solution not aerated, ordinary solution culture (3) Solution not aerated and the oxygen from the air prevented from dissolving into the solution by vinyl film coverings 2. In autumn and winter crops, the effect of aeration was observed to be most remarkable in radishes, cabbages and peas, and next to them in Welsh onions, but in such crops as broad beans, strawberries and onions, aeration was not so effective. On and after April the growth of onions and broad beans was accelerated by aeration, while in the early season greater growth of them was observed in the solution in which aeration was prevented. 3. In summer crops, tomatoes and cucumbers showed a greater increase of growth by the aeration, while on egg-plants, peppers and sweet potatoes aeration had little effect and “Fujimame” and asparagus beans grew well in non-aerated solution. The growth of cucumbers was accelerated by aeration, but on the other hand, it continued to grow pretty well even in the solution with lower oxygen pressure. 4. The absorption of NH4-N, P, and K was disturbed by the decrease of oxygen in the solution, however, that of NO3-N was not so much affected. In some crops the absorption of NO3-N was increased rather at low oxygen pressure. One reason for the distinct increase of growth in the early stage of broad beans under lower oxygen condition, may be due to this phenomenon. 5. In Welsh onions, cabbages, and radishes the absorption of NO3-N was not so remarkable at lower oxygen pressure.
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蔬菜の根の生理に関する研究(第5報) : 水耕栽培における通気が蔬菜類の生育並びに養分吸収に及ぼす影響について

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