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An experimental apparatus for measuring electrical potential of crops

一种测量农作物电势的实验装置

基本信息

批准号：
09556004
负责人：
IWAMA Kazuto
金额：
$ 6.91万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09556004/
关键词：
Electrical potential Water content of plant Plant pH Ag-AgCl electrode Water stress Rice Potato Kidney bean 銀塩化銀電極

项目摘要

An experimental apparatus on a trial basis designed for measuring electrical potential on a plant surface was made to estimate water and nutrient stress of crops under field conditions (Exp. 1). and tested with kidney bean (Exp. 2), potato (Exp. 3) and rice (Exp. 4).Exp.l. The developed system for measurements of activation voltage generating in the plants has pre-amplifiers, power source, connecting box to supply the power to many amplifiers, and calibrator. Activation voltage of the plants was measured with the high impedance amplifier designed by voltage follower type.Exp.2. In the first, copper tube inserted into soil was confirmed to be reliable as a standard electrode. Secondly, an electrical component of the surface potential was examined by measurement of electrical potential at xylem of different parts in the stem. To investigate uncertain repeatability on a daily change of the surface potential, last experiment was conducted by measurement of the surface potential in the dark room.Exp.3. The surface voltage generally started to decrease after sunrise, maintained low value during mid-day, and increased during the night. The difference between night and mid-day was about 50-100 mV.However, the difference was also found between the stem nodes of one plant and also of different plants.Exp.4. The surface potentials differed among positions in rice leaf-sheath, but they were additive. The gradient of the surface potential was not, however, linear with the vertical positions. Continuous change of the potentials was often interrupted at a certain position and the interrupted positions moved time to time throughout a day. Therefore, a small difference (possibly less than a few mm) in measurement positions will be a major cause of the potential variation among individual plants.

在试验的基础上，设计了一种用于测量植物表面电位的实验装置，以评估田间条件下作物的水分和养分胁迫（实验）。1）。并用菜豆（Exp. 2）、马铃薯（Exp. 3)大米（Exp. 4）实验1.所开发的用于测量工厂中产生的激活电压的系统具有前置放大器、电源、向多个放大器供电的接线盒和校准器。用电压跟随器型高阻放大器测量植物的激活电压。首先，证实了插入土壤中的铜管作为标准电极是可靠的。其次，通过测量茎中不同部位木质部的电位，研究了表面电位的电学分量。为了研究表面电位每日变化的不确定重复性，最后一个实验是在暗室中测量表面电位。表面电压一般在日出后开始下降，中午维持较低值，夜间上升。夜间和中午之间的差异约为50-100 mV。然而，同一植物的茎节之间以及不同植物的茎节之间也存在差异。水稻叶鞘不同部位的表面电位存在差异，但它们是加性的。然而，表面电位的梯度与垂直位置不是线性的。连续变化的电位往往在某一位置被中断，中断的位置在一天中时移时移。因此，测量位置的微小差异（可能小于几mm）将是个体植物之间潜在变化的主要原因。