Studies on the carbon dioxide environment for plant growth. I

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  • IMAZU T.
    College of Agriculture, University of Osaka Prefecture
  • YABUKI K.
    College of Agriculture, University of Osaka Prefecture
  • ODA Y.
    College of Agriculture, University of Osaka Prefecture

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Other Title
  • 炭酸ガス環境に関する研究 (第1報)
  • 炭酸ガス環境に関する研究-1-Co2濃度がフダンソウの生育におよぼす影響
  • タンサンガス カンキョウ ニ カンスル ケンキュウ 1 Co2 ノウド ガ フダンソウ ノ セイイク ニ オヨボス エイキョウ
  • Effects of carbon dioxide concentration on the growth of Swiss chard (<i>Beta vulgaris</i> L. var. <i>flavescens</i> D.C.)

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Abstract

Swiss chard (Beta vulgaris L. var. flavescens D.C.) was grown in gravel culture using Hoagland′s No. 2 solution under polyvinyl plastic growth chambers to investigate the practice of CO2 enrichment of the atmosphere on plant growth. Five chambers were employed with each at 300 (air), 600, 900, 3, 000 and 6, 000 or 30, 000ppm CO2, the concentration being regulated by adjusting the flow of CO2 and air into the chamber. Treatments were for 9 weeks in the early summer and winter experiments and for 24 days in the midsummer experiment. Benchs were maintained above 15°C during the winter experiment.<br>In all experiments, fresh weight and dry weight yields, plant height, and leaf areas markedly increased with increasing CO2 concentrations; but, no significant difference was observed in the number of leaves. In the summer at 3, 000ppm, dry weight yield was five times more than those grown at 300ppm and in the winter the yield was twice as those grown in 300ppm. Fresh weight and dry weight yields did not reach a maximum even at 30, 000ppm.<br>Analyses of leaves at the end of the experiments showed that percentages of the N, P and K on a dry weight basis were nearly the same regardless of treatment.

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