Studies on the carbon dioxide environment for plant growth III

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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3報)
  • 炭酸ガス環境に関する研究-3-CO2濃度がcrisp headレタスの生育,結球,収量に及ぼす影響
  • タンサンガス カンキョウ ニ カンスル ケンキュウ 3 CO2 ノウド ガ crisp head レタス ノ セイイク , ケッキュウ , シュウリョウ ニ オヨボス エイキョウ
  • Effect of the carbon dioxide concentrations on the growth, heading and yield of crisp head lettuce (<i>Lactica sativa</i> L. var. <i>capitata</i>)

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Abstract

Lettuce (Lactica sativa L. var. capitata, cultivar Great Lakes) 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 the growth.<br>Four chambers were employed with each at 300 (air), 900, 1, 500 and 3, 000ppm CO2 for 8 hours daily from April 1 to May 20, 1965.<br>1. Difference in growth and appearance of the plants grown under the normal and the above normal levels of CO2 were apparent within 20 days. Fresh and dry-weight yields, number of leaves and leaf area increased with increasing CO2 concentrations, while percentage of bolting decreased. An enhancement of NAR by increasing CO2 concentrations was observed.<br>2. The effect of increased CO2 concentrations was on growth and yield were compared with outer and inner leaves of lettuce at the end of the experiment. In the inner leaves, fresh-and dry-weight yields and number of leaves increased with higher levels of CO2, and also in the outer leaves similar effects were found in all except number of leaves.<br>3. The contents of chlorophyll, nitrogen, phosphorus and potassium in leaves were determined for outer and inner leaves at the end of the experiment. All the measured constituents varied with the part of plant analyzed or CO2 concentrations treated. Chlorophyll contents in both outer and inner leaves tended to decrease with higher levels of CO2 regardless of plant part. In the outer leaves, N, P and K contents increased with increasing CO2 concentrations, while in the inner leaves a decrease occurred in P and K contents but N increased as CO2 conentrations were raised.

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