Plant Cultivation in a Closed Ecological Life Support System (CELSS)
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概要
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We looked at the basic specifications of a plant cultural system as a subsystem, in a closed ecological life support system (CELSS).<BR>In order to confirm the possibility of plant culture under microgravity in space, the growth rates and morphological characteristics of lettuce and turnips cultivated upside down were investigated on Earth. Rooting beds were arranged above and below an array of fluorescent lamps. Plants were grown normally on the lower bed and upside down on the upper bed.<BR>The results were as follows: the top fresh weight of lettuce in the lower and upper beds was 42 and 46 g /plant, respectively, 30 days after the treatment. For turnips, the fresh weight of leaves and the swollen root, in the lower and upper beds, was 60 and 66 g /plant, and the weight of the swollen root was 30 and 42 g /plant, respectively, 25 days after the treatment. The growth rate for both species grown in the upper beds tended to be slightly higher than those in the lower beds. In addition, there were no remarkable morphological differences between the lower and upper plots for either plants. The above facts show that phototropism can overcome geotropism. A PPFD of about 300 μE /m<SUP>2</SUP> /s at the plant canopy is sufficient to ensure that vegetable crops such as lettuce and turnips grow normally, in the direction of a light source regardless of gravity direction.<BR>A method of growing more plants in a small space is proposed. Our system is composed of small units and each unit is constructed of vertical panels supporting rooting beds arranged on two sides of an array of fluorescent lamps. Plants in these beds grow horizontally toward the lamps. Assuming that vegetable crops such as lettuce and turnips are cultivated at a planting density of 25 plants /m<SUP>2</SUP>, 200 plants can grow in each unit and 100 plants per 1m<SUP>2</SUP> of the floor area.<BR>In order to obtain basic data for the gas balance in the CELSS, the rates of CO<SUB>2</SUB> absorption and O<SUB>2</SUB> release for lettuce and turnips growing in this system were also estimated in this study.
- 生態工学会の論文
生態工学会 | 論文
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