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Table 2 Sensitivity scores for each electrical variable in conditions similar to the widely used LCR meters

From: Benchmarking electrical methods for rapid estimation of root biomass

Electrical variable Frequency (Hz) Sensitivity score r 2
Cp 116 0.49 0.542
  1250 0.46 0.524
  13,458 0.50 0.605
Cs 116 0.10 0.119
  1250 0.29 0.331
  13,458 0.38 0.436
Rp 116 0.40 0.584**
  1250 0.45 0.635**
  13,458 0.38 0.599**
Rs 116 0.39 0.563**
  1250 0.44 0.615**
  13,458 0.44 0.639**
G 116 0.28 0.317
  1250 0.35 0.394
  13,458 0.45 0.502
Z 116 0.39 0.574**
  1250 0.44 0.628**
  13,458 0.41 0.622**
X 116 0.18 0.281
  1250 0.42 0.595**
  13,458 0.46 0.650**
Θ 116 0.00 0.197
  1250 0.00 0.214
  13,458 0.03 0.267
  1. The sensitivity scores, coefficients of determination with root dry mass (r 2), for each electrical variable in LCR meter conditions (test signal frequencies of 116, 1250 and 13,458 Hz, in 2T configuration). The highest sensitivity score is obtained by parallel capacitance (Cp) at 13,458 Hz
  2. *** Linear regression is significant at the 0.01 level
  3. ** Linear regression is significant at the 0.05 level