Studies on the Control of Gaseous Environment in the Rhizosphere

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  • 根圏ガス環境の制御に関する研究
  • 根圏ガス環境の制御に関する研究 (2) : キュウリの生育に対する根圏空気中のCO2の影響
  • コンケン ガス カンキョウ ノ セイギョ ニ カンスル ケンキュウ 2 キュウ
  • (2) Effect of Carbon Dioxide in the Rhizosphere on Growth of Cucumber
  • (2) キュウリの生育に対する根圏空気中のCO<sub>2</sub>の影響

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The relationship between CO2 concentration in the rhizosphere and the growth of cucumber plant was studied. Growth rates of cucumber plant growing in the sand culture were compared for CO2 concentration varying from 0 to 5% in the rhizosphere. The effects of CO2 and O2 in the rhizosphere on photosynthetic rate were then investigated.<br>The results obtained were as follows.<br>(1) The growth suppression of cucumber plant occurred at 0.5-2% CO2 in the rhizosphere. Total dry weight and leaf area decreased up to 80-90% by the increase of CO2 concentration (2-5%) in the rhizosphere.<br>(2) The growth suppression by CO2 was found five days after the beginning of treatments.<br>(3) Water content of the top decreased with increase in CO2 concentration in the rhizosphere.<br>(4) Photosynthetic rate decreased two hours after the beginning of treatments even at 3-5% CO2. After four hours, photosynthetic rate at 10% CO2 declined up to 85% of that before the treatment, while it retained 95% when treated with 10% O2.<br>As described above, it is proved that the growth of cucumber plant is suppressed with increase in CO2 concentration in the rhizosphere before the suppression by decreasing O2 concentration occurs.

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