Studies on the carbon dioxide enrichment for plant growth, VII. Changes in dry matter production and photosynthetic rate of cucumber during carbon dioxide enrichment
✍ Scribed by Masatoshi Aoki; Kazutoshi Yabuki
- Publisher
- Elsevier Science
- Year
- 1977
- Weight
- 505 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0002-1571
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✦ Synopsis
Aoki, M. and Yabuki, K., 1977.
Studies on the carbon dioxide enrichment for plant growth, VII. Changes in dry matter production and photosynthetic rate of cucumber during carbon dioxide enrichment. Agric. Meteorol., 18: 475--485.
The dry matter production and the rate of photosynthesis of cucumber under CO2enrichment were measured.
The effect of CO 2-enrichment on the growth was great at 1,200 ppm and 2,400 ppm with the growth of 1.5--1.8 times greater than that of the control plot. The effect of 5,500 ppm enrichment, however, decreased with the duration of enrichment. The most effective CO 2 concentration for the growth varied from the higher to the lower concentration as the enrichment continued. This was because the effect of enrichment on the growth rate changed with the duration.
The CO2-enrichment was effective on the rate of net photosynthesis of cucumber leaves at the beginning. As the enrichment continued, however, the rates at the higher CO~ concentrations rapidly decreased to below that at the normal CO2 concentration. The decrement in net photosynthetic rate was greater when the concentration was higher and the duration of enrichment was longer.
The reduction in the effect of enrichment on photosynthetic rate during enrichment accounted for the change in the most effective concentration on the growth rate with the duration.