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Volume 25 (1987)
- Issue 4 Pages 141-
- Issue 3 Pages 75-
- Issue 2 Pages 25-
- Issue 1 Pages 1-
Volume 25, Issue 1
Displaying 1-4 of 4 articles from this issue
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II. Light Power Consumption for Lettuce Production under Close Illumination by Fluorescent Lamps.Akira IKEDA, Kenji ESAKI, Yoshitaka KAWAI, Shigeki NAKAYAMA1987 Volume 25 Issue 1 Pages 1-5
Published: March 31, 1987
Released on J-STAGE: June 22, 2010
JOURNAL FREE ACCESSIn order to examine practical application of the omnidirectional illumination method, a plane growth chamber equipped with fluorescent lamps to closely illuminate the plant and painted inside white was developed, and the light power consumption for the production of lettuce in plant factory was investigated by using this chamber.
Under the optimum condition of plant population and light intensity, the light power consumption was found to be 0.8 kWh/100 g-fresh weight with the dry weight production efficiency being 7.9% of the total visible light radiation energy of the fluorescent lamps. Thus, it is confirmed that a considerable reduction of light power consumption can be achieved by the close illumination method.View full abstractDownload PDF (1775K) -
Toru KATO, Lingfeng ZHONG1987 Volume 25 Issue 1 Pages 7-12
Published: March 31, 1987
Released on J-STAGE: June 22, 2010
JOURNAL FREE ACCESSTomato (Fukuzyu No. 2), eggplant (Hayabusa) and sweet pepper (Sinsakigakemidori) were grown in sand culture under glasshouse condition in order to clarify the differences in the physiological and ecological responses of them to different concentration of nutrient solution.
1. Growth in tomato was faster than in eggplant and sweet pepper. Plants growth in a standard solution showed a higher dry weight than those grown in 1/2, 2 and 4 times concentration of standard solution. As concentration of nutrient solution increased or decreased from the standard solution, dry weight decreased in each crop, showing a most remarkable effect in sweet pepper followed by eggplant and then tomato.
2. T/R (top: root) ratio was higher in tomato than in eggplant and sweet pepper. The partitioning percentage of dry matter of the stem in tomato T/R ratio was larger than that of eggplant and sweet pepper which showed a large partitioning percentage of dry matter of the leaves in the T/R ratio. As the concentration of nutrient solution increased, the partitioning percentage of dry matter of the roots was reduced and that of the leaves increased.
3. There was a gradual decline in the apparent assimilation, transpiration rate of the leaves and respiration rate of the fine roots in each crop with increases in the concentration of nutrient solution. The severity of these tendencies was in the following ascending order, tomato, eggplant and sweet peppe.View full abstractDownload PDF (775K) -
Toru KATO, Huining LOU1987 Volume 25 Issue 1 Pages 13-18
Published: March 31, 1987
Released on J-STAGE: June 22, 2010
JOURNAL FREE ACCESSSeedlings of eggplant, cv.‘Kokuyou’and sweet pepper, cv.‘Shinsakigakemidori’were grown in three different media (soil; 1 soil: 1 bark compost; bark compost) at two fertilizer application levels 40N: 80P: 40K kg/10a and 20N: 40P: 20K kg/10a) for 50 days and then these were transplanted to a vinyl house.
1) Seedlings grown with the high level of fertilizer application showed vigorous growth and a higher stem weight/root weight (S/R) value than those grown with the low level.
2) The higher yield was obtained on the plants from the seedlings grown in soil and those grown in 1 soil: 1 bark compost, both treated with the low level of fertilizer application, which grew faster, developed a deeper and wider root system consisting mainly in thick roots over 1 mm in diameter both in eggplant and sweet pepper. The lowest yield was obtained on the plants from the seedlings which grown in bark compost with the same low level of fertilizer application.
3) The yield was closely correlated to the number of thick roots over 1 mm in diameter. The more the number of thick roots, the higher the yield.
4) Plants with the lower S/R value at transplanting time developed better and showed a higher yield. There was also a correlation between the yield and S/R value.
5) It may be concluded that S/R value is useful as an index for judging the quality of seedling.View full abstractDownload PDF (673K) -
Toru KATO, Huining LOU1987 Volume 25 Issue 1 Pages 19-23
Published: March 31, 1987
Released on J-STAGE: June 22, 2010
JOURNAL FREE ACCESSImmediately after cotyledon expansion, uniform seedlings of eggplant, cv.‘Hayabusa’were planted in three different media (soil, 1 soil: 1 bark, bark) in three different size polyethylene pots (18 cm, 15 cm, 12 cm) in order to examine the effects of pot size and media on the growth of seedlings and subsequent yield.
Growth of seedlings was affected by pot size and media during the course of long raising seedlings. The highest growth was obtained on the plants grown in 18 cm plots and also the smallest S/R value was found on these seedlings at transplanting time.
The yield decreased as pot size was smaller. The yield was higher on the plants from seedlings grown in soil than those grown in the two other media. The highest yield was obtained on the plants from seedlings grown in 18 cm pots filled with soil or 1 soil: 1 bark medium.
The plants from seedlings grown in 18 cm pots developed deeper and larger root system and also formed more thick roots over 1 mm in diameter than those grown in 15 cm and 12 cm pots. There was found a close correlation between the number of thick roots and yield.
Plants from seedlings with the smaller S/R value at transplanting time produced higher yield. There also existed a close correlation between S/R and yield.View full abstractDownload PDF (594K)
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