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Table 2 Summarized references using EIS method of in situ plant root research

From: Electrical impedance spectroscopy (EIS) in plant roots research: a review

Method

References

Plant

Growth substrate

Concern

Frequency range (Hz)

No. of frequency

No. of plant

Electrical Impedance Spectroscopy (EIS)

[39]

Willow

Hydroponics

Resistance, capacitance

40 ~ 340 k

488

64

[24]

Tomato

Potting

oxisol

Resistance, capacitance

10 ~ 1 M

51

12

[73]

Sitka spruce

Field

Resistance, capacitance

40 ~ 340 k

–

18

[68, 72]

Willow

Hydroponics

Resistance, capacitance

60 ~ 60 k

31

15

[71]

Maize

Potting

Arenosol

Resistance, capacitance, Phase Angle

100-10 k

55

18

[70, 74]

Scots pine

Potting

Perlite

Resistance, capacitance

5 ~ 100 k

44

72

[69]

Scots pine

Potting

Perlite

Resistance, capacitance

loss factor δ

80 ~ 1 M

42

630

[44]

Pea

Hydroponics

Resistance, capacitance, Phase Angle

800 ~ 1 M

100

30

[53]

Pea

Potting

Perlite

Resistance, capacitance, Phase Angle

30 ~ 1 M

100

30–40