低肥料施用下で土耕栽培されたオオムギの生体電位自動検出に連動した 20Ｈｚ赤色点滅光照射による成長の改善

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The detection of a 20 Hz bioelectric potential enables the determination of the nutritional status of the plant without breaking. In addition, low-intensity light emitted at 20 Hz improves plant growth. Excessive irradiation, however, decreases plant growth, thereby showing the importance of an appropriate amount of irradiation for improving plant growth. We recently combined nutrient diagnosis and irradiation methods into a complete method to determine whether plant growth could be improved. This study was conducted to clarify the effect on growth recovery using this method. The total system was applied to barley cultivated in soil, where the plants were irradiated based on bioelectric potential measurements. At the time of harvest, based on yield components (grain weight, number of ears), we developed the following conclusions and recommendations for barley in low-nutrient conditions. Barley in low-nutrient conditions displayed a 20 Hz bioelectric potential.1. The amount and timing of the 20 Hz irradiation were determined based on diagnosis of the 20 Hz bioelectric potential signal from the barley plants. Irradiation was carried out during the daytime, according to the strength of the 20 Hz bioelectric potential signal.2. Barley irradiated at 20 Hz in conjunction with the automatic detection of a bioelectric signal demonstrated better growth than nonirradiated plants.3. Nitrate uptake in barley grown in low-nutrient conditions was increased by exposing it to weak red light at 20 Hz, in conjunction with the automatic detection of bioelectric signal from the plants (Table 4).This study revealed that barley cultivated at a low nutrient level by a system of irradiation with automatic bioelectric detection could achieve higher yield than barley grown by the more common method using a large amount of fertilizer.

低肥料施用下で土耕栽培されたオオムギの生体電位自動検出に連動した 20Ｈｚ赤色点滅光照射による成長の改善

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