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1993 Fiscal Year Final Research Report Summary

Developmental Research for Constructing an Equipment to Measure Electrical Potential Generating in Crops

Research Project

Project/Area Number 05556003
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 作物学
Research InstitutionHokkaido University

Principal Investigator

IWAMA Kazuto  Hokkaido Univ., Crop Science, Associate Professor, 農学部, 助教授 (70144219)

Co-Investigator(Kenkyū-buntansha) SATO Hajime  Hokkaido Univ.of Education, Crop Science, Professor, 教育学部, 教授 (20091530)
TAKAYANAGI Shigeru  Hokkaido Univ.of Education, Physics, Professor, 教育学部, 教授 (50013529)
YAMAGUCHI Junichi  Hokkaido Univ., Plant Nutrition, Associate Professor, 農学部, 助教授 (80001478)
Project Period (FY) 1993 – 1994
KeywordsAg-AgCl Electrode / Electrical Potential / Kidney Bean / Plant pH / Potato / Rice / Water Content of Plant / Water Stress
Research Abstract

An experimental apparatus on a trial basis designed for measuring electrical potential on a plant surface was made to estimate water stress of crops under field conditions, and tested with several crops grown under various nutritional and soil water conditions.
The apparatus was made up from an Ag-AgCl electrode connecting with a preamplifier of a high impedance circuit (10^<12>OMEGA). A pair of two electrodes was contacted on the different parts of stem surface in one plant. The difference in electrical potential between the two parts was detected and recorded with a pen-recorder and/or a data-logger. The apparatus was tested with rice plants cultured in various nutritional solutions, and with potatoes and kidney beans grown under different soil water conditions.
As a result of the preliminary observations with this apparatus, we detected relatively large differences, large than 100 mV,in electrical potential between the plants with different treatments. A circadian rhythm of electrical potential in the crops was also indicated in some measurements. However, the reliability of the measurements was still inadequate for common usage under field conditions. We further need some improvement of the present apparatus and of the method, especially how to make contact the electrode on a plant surface.

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Published: 1996-04-15  

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