Studies of the carbon dioxide in the cucumber field
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概要
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Carbon dioxide was microclimatically measured, for it is one of enviromental elements which influences to cucumber plants.Carbon dioxide concentration in the air was determined with a Haldne gas analyzer, which was sunk in a water bath to lessen the analysical errors caused by temperature. The results of the experiment are summarized as follows:1. When the hot cap and the cold frame bed, where young cucumber plants were planted, were investigated, it was found that the former contained more carbon dioxide than the latter, and that the cold frame was more easily influenced by the weather.2. The gas concentration in the cucumber field was measured in the daytime under various weathers. The gas surrounding the cucumber vine showed the lowest concentration at 10a.m. on fine days, but it increased in concentration after that time. On rainy days, there was the inverse tendency in the gas concentration.3. The fluctuation of carbon dioxide concentration in the course of a day was investigated at various heights of the cucumber vine. The result was that the maximum concentration at every height occurred at 10 p.m., and that the minimum at 6p.m. The fluctuation at various heights seemed to be much the same as that of the middle height.4. The carbon dioxide, which is released from the leaves and the soil surface of the cucumber field, affected to the carbon dioxide concentration of the air. The maximum amounts of the gas from the leaves and the soil surface were found at 10p.m. and it coincided with the maximum concentration of the gas surrounding the vine. The minimum concentration of the gas there came 2p.m. The reason is supposed to be that in the daytime, the gas released from the leaves and the soil surface decrease in amount and there occurs assimilation.5. When the distribution of carbon dioxide concentration in the cucumber field was investigated, it was found that the concentration was much the same in every part at the midday, about the sunset and at the midnight, and that the concentration was higher in the west side of the vine than in the east side about the sunrise.
- 日本農業気象学会の論文
日本農業気象学会 | 論文
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