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Optimal light for greenhouse culture of American ginseng seedlings
John T. A. Proctor,John W. Palmer 고려인삼학회 2017 Journal of Ginseng Research Vol.41 No.3
Three greenhouse experiments with American ginseng seedlings growing under light levels from 4.8% to 68% showed a quadratic response for root dry weight, giving an optimal root dry weight of 239 mg (range 160e415 mg) at an optimal light level of 35.6% (range 30.6e43.2%).
Growth, Dry Matter Partitioning and Photosynthesis in North American Ginseng Seedlings
John T. A. Proctor,John W. Palmer,John M. Follett 고려인삼학회 2010 Journal of Ginseng Research Vol.34 No.3
North American ginseng seedlings (Panax quinquefolius L.) were grown in pots in heated greenhouses, in a cool greenhouse, or in the field, in 11 experiments at various times over 16 years. Crop establishment, dry matter partitioning, photosynthesis, radiation use efficiency and carbon budget were measured and/or calculated in some years. Once the seedling canopy, of about 20 ㎠ per seedling, and a leaf area index of 0.37, was established, about 40 days after germination, full canopy display lasted about 87 days. Only 16.6% of the incoming solar radiation was intercepted by the crop, the remainder falling on the mulched soil surface. Total and root dry matter accumulations in the cool greenhouse and in the field were about double that in the heated greenhouses. Partitioning of dry matter to roots (economic yield or harvest index) in the cool greenhouse and in the field was 73% whereas it was 62.5% in the heated greenhouses. The relationship between root dry matter and radiation interception during the full canopy period was linear with growth efficiencies of 2.92 ㎎ MJ?¹ at 4.8% of incoming radiation and 0.30 ㎎ MJ?¹ at 68% of incoming radiation. A photosynthetic rate of 0.39 g m?² h?¹ was attained at light saturation of about 150 μ㏖ m?² s?¹ (7.5% of full sunlight); dark respiration was 0.03 g m?² h?¹, about 8.5% of maximum assimilation rate. Estimates of dry matter accumulation by growth analysis and by CO₂ uptake were similar, 6.21 vs. 7.62 ㎎ CO₂, despite several assumptions in CO₂ uptake calculations.
Growth, Dry Matter Partitioning and Photosynthesis in North American Ginseng Seedlings
Proctor, John T.A.,Palmer, John W.,Follett, John M. The Korean Society of Ginseng 2010 Journal of Ginseng Research Vol.34 No.3
North American ginseng seedlings (Panax quinquefolius L.) were grown in pots in heated greenhouses, in a cool greenhouse, or in the field, in 11 experiments at various times over 16 years. Crop establishment, dry matter partitioning, photosynthesis, radiation use efficiency and carbon budget were measured and/or calculated in some years. Once the seedling canopy, of about $20\;cm^2$ per seedling, and a leaf area index of 0.37, was established, about 40 days after germination, full canopy display lasted about 87 days. Only 16.6% of the incoming solar radiation was intercepted by the crop, the remainder falling on the mulched soil surface. Total and root dry matter accumulations in the cool greenhouse and in the field were about double that in the heated greenhouses. Partitioning of dry matter to roots (economic yield or harvest index) in the cool greenhouse and in the field was 73% whereas it was 62.5% in the heated greenhouses. The relationship between root dry matter and radiation interception during the full canopy period was linear with growth efficiencies of $2.92\;mg\;MJ^{-1}$ at 4.8% of incoming radiation and $0.30\;mg\;MJ^{-1}$ at 68% of incoming radiation. A photosynthetic rate of $0.39\;g\;m^{-2}\;h^{-1}$ was attained at light saturation of about $150\;{\mu}mol\;m^{-2}\;s^{-1}$ (7.5% of full sunlight); dark respiration was $0.03\;g\;m^{-2}\;h^{-1}$, about 8.5% of maximum assimilation rate. Estimates of dry matter accumulation by growth analysis and by $CO_2$ uptake were similar, 6.21 vs. 7.62 mg $CO_2$, despite several assumptions in $CO_2$ uptake calculations.
Optimal light for greenhouse culture of American ginseng seedlings
Proctor, John T.A.,Palmer, John W. The Korean Society of Ginseng 2017 Journal of Ginseng Research Vol.41 No.3
Three greenhouse experiments with American ginseng seedlings growing under light levels from 4.8% to 68% showed a quadratic response for root dry weight, giving an optimal root dry weight of 239 mg (range 160-415 mg) at an optimal light level of 35.6% (range 30.6-43.2%).