Plant is affected by environmental factors. For example, these are temperature, humidity and light intensity. The light intensity affected strongly to the plant. The plant produces glucose and oxygen with photosynthesis. Moreover, light intensity is important to purify the contaminants in the atmosphere. In this study, it was examined whether the plant is affected by temperature, wind grade and soil moisture using bioelectric potential characteristics of the plant. Especially plant bioelectric potential to light intensity change was measured. The measurement was carried out in indoor and outdoor. At that analysis, the integrated value of plant bioelectric potential for 1 minute (v m1 ) was adopted.The histogram of v m1 to the indoor experiment result is shown in Fig.1. The v m1 value rises when the sunlight is irradiated. At this time, the light intensity of the sunlight was three times compared with other indoor experiments.The histogram of v m1 to each experiment result in outdoor is shown in Fig.2. The darkness under is v m1 = 34. The distribution of data is binominal distribution. Moreover, the sunlight was min = 31, and max = 250. As for the result, the differences of plant bioelectric potential characteristics in the indoor and outdoor were recognized.The scatter diagram of v m1 and the light intensity mean value are shown in Fig.3. It rises rapidly up to about 10000lx, and it tends to saturate the vm1 value afterwards. Moreover, a high correlation was indicated between the v m1 and light intensity. The correlation coefficient was R 2 = 0.94. It becomes obvious that the plant is affected strongly by light intensity and the plant can understand the environmental factors like light intensity. Moreover, the sigmoid function in Figure 3 is admitted in the photosynthesis curve of the plant. It is necessary to verify it for this respect in the future. The characteristics are found by measuring bioelectric potential of the plant. The environmental sensing can be possible by the use of the plant bioelectric potential.
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