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- W2065655893 abstract "Abstract Tobacco ( Nicotiana tabacum L.), essentially a nursery plant during seedling growth, is grown in a protected plant bed until it attains the size to be transplanted into the field. Enchancement of growth rates during seedling culture would have advantages in production of tobacco seedlings, as well as bedding plants. Enrichment of atmospheric CO 2 is a generally recognized technique of increasing growth rates. Experiments were conducted in controlled‐environment chambers to evaluate the immediate effects of CO 2 enrichment on seedling growth of tobacco, the carryover effects to post‐transplant growth, and nutritional requirements for maximum response to CO 2 enrichment. Tobacco seedlings were grown at two rates of nutrient application in atmospheres containing either ambient (400 ppm) or enriched (1,000 ppm) CO 2 levels. At the time of transplanting half of the plants from each CO 2 environment were reciprocally exchanged. During seedling culture, Relative Growth Rate (RGR) was enhanced CO 2 enrichment but was depressed by the higher nutrient application rate. The RGR to CO 2 enrichment was reversed during post‐transplant culture. For either CO 2 environment, RGR during seedling growth was nearly three‐fold RGR during posttransplant culture. The reduction in RGR with CO 2 enrichment occurred for both a 9‐hour and a 15‐hour light period of 450 hectolux intensity. The lower RGR for CO 2 enrichment during post‐transplant culture was associated with increased starch in leaf tissues. These data support the hypothesis that, although growth response may temporarily be enhanced by CO 2 enrichment, it must decline to a level similar to that of plants raised under ambient CO 2 ." @default.
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- W2065655893 date "1975-09-01" @default.
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- W2065655893 title "Growth of Young Tobacco Plants as Affected by Carbon Dioxide and Nutrient Variables <sup>1</sup>" @default.
- W2065655893 doi "https://doi.org/10.2134/agronj1975.00021962006700050026x" @default.
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