Study on Estimation of Water Stress of Plant by Vibration Measurement of Leaf

2015 Fiscal Year Final Research Report

• Project/Area Number: 25450387
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Agricultural environmental engineering/Agricultural information engineering
• Research Institution: Toin University of Yokohama
• Principal Investigator: Sano Motoaki 桐蔭横浜大学, 医用工学部, 教授 (90206003)
• Co-Investigator(Kenkyū-buntansha): SUGIMOTO Tsuneyoshi 桐蔭横浜大学, 大学院工学研究科, 教授 (80257427)
• Research Collaborator: NAKAGAWA Yutaka ; UCHIKAWA Chiharu ; OHDAIRA Takeyuki ; SHIRAKAWA Takashi
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 葉の固有振動 / 植物の水ストレス / ハイスピードカメラ / 非侵襲計測 / 超節水精密農業

Outline of Final Research Achievements

By examining the relationship between the water stress of plant and the natural frequency of flexural vibration of leaf with a high-speed camera, it was found that the natural frequency of the flexural vibration of leaf blade itself is not so much changed with the wilting. On the other hand, the natural frequency of leaf by flexural vibration of petiole was decreased significantly with wilting. In addition, it was confirmed that the natural frequency of healthy leaf by flexural vibration of petiole shows diurnal variation, and it increases during daytime, but decreases during night. Moreover, this behavior was reversed with the increasing of water stress of plant.
Thus, it was concluded that the measurement of the natural frequency of leaf by flexural vibration of petiole is more effective for the estimation of water stress of plant than the measurement of flexural vibration of leaf blade itself. That is, simple vibration measurement using such as a laser displacement meter is enough.

Free Research Field

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