Benchmarking electrical methods for rapid estimation of root biomass

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

Electrical variable	Frequency (Hz)	Sensitivity score	r ²
C_p	116	0.49	0.542
	1250	0.46	0.524
	13,458	0.50	0.605
C_s	116	0.10	0.119
	1250	0.29	0.331
	13,458	0.38	0.436
R_p	116	0.40	0.584**
	1250	0.45	0.635**
	13,458	0.38	0.599**
R_s	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

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 (C_p) at 13,458 Hz
*** Linear regression is significant at the 0.01 level
** Linear regression is significant at the 0.05 level

ISSN: 1746-4811