Table 2. Conversion equations for estimating measured electrical conductivity on a saturated extract.

Original Measurement	Equation	Model r2	Specified Texture	Notes	Source
1:1	ECe = 3(EC1:1)	--	--	Theoretical & likely to produce a higher predicted than necessary. Specific multiplication factors for conversion ranged between 2.78 and 1.6 based on the dominant salt type.	[64]
1:1	ECe = 3.01(EC1:1) -0.06	0.98	Coarse	Suspension to Saturated Extract	[60]
1:1	ECe = 3.01(EC1:1) -0.77	0.98	Medium	Suspension to Saturated Extract	[60]
1:1	ECe = 2.66(EC1:1) -0.97	0.98	Fine	Suspension to Saturated Extract	[60]
1:1	ECe = 1.85(EC1:1)	0.85	--	Only the regression without y-intercept was used in their validation. The regression equation of their validation set is also significantly different than that of their training set. Only their equation without a y-intercept is used here.	[67]
1:1	ECe = 3.01(EC1:1) -0.06	--	Coarse	Specifically states they are not well calibrated & are a rough guide to interpretation only	[68]
1:1	ECe = 3.01(EC1:1) -0.77	--	Medium	Specifically states they are not well calibrated & are a rough guide to interpretation only	[68]
1:1	ECe = 2.96(EC1:1) -0.95	--	Fine	Specifically states they are not well calibrated & are a rough guide to interpretation only	[68]
1:1	ECe = 1.93(EC1:1) -0.57	--	--	1:1 predictions were closer to ECe than their other dilutions (1:2.5, 1:5)	[69]
1:1	ECe = 2.72(EC1:1) -1.27	0.99	Sandy	--	[63]
1:1	ECe = 2.42(EC1:1)	0.98	Sandy	--	[63]
1:1	ECe = 2.15(EC1:1) -0.44	0.99	Loamy	--	[63]
1:1	ECe = 2.06(EC1:1)	0.98	Loamy	--	[63]
1:1	ECe = 2.23(EC1:1) -0.58	0.98	Combined	--	[63]
1:1	ECe = 2.11(EC1:1)	0.98	Combined	--	[63]
1:1	ECe = 3.35(EC1:1)	0.95	—	--	[69]
1:2	ECe = 2.79(EC1:2) +0.71	0.91	Coarse	Extract to saturated extract	[60]
1:2	ECe = 2.35(EC1:2) -0.36	0.95	Medium	Extract to saturated extract	[60]
1:2	ECe = 2.16(EC1:2) +0.03	0.97	Fine	Extract to saturated extract	[60]
1:5	ECe = 5.97(EC1:5) -1.17	--	--	1:1 predictions were closer to ECe than their other dilutions (1:2.5, 1:5)	[69]
1:5	ECe = 8.22(EC1:5) -0.33	0.98	Sandy	--	[63]
1:5	ECe = 7.98(EC1:5)	0.98	Sandy	--	[63]
1:5	ECe = 7.58(EC1:5) +0.06	0.99	Loamy	--	[63]
1:5	ECe = 7.62(EC1:5)	0.99	Loamy	--	[63]
1:5	ECe = 7.68(EC1:5) -0.16	0.98	Combined	--	[63]
1:5	ECe = 7.57(EC1:5)	0.98	Combined	--	[63]
1:5	ECe = 5.35(EC1:5)	0.96	Combined	See source for greater range of specialized conversions by texture & presence of gypsum	[70]
1:5	ECe = 7.31(EC1:5)	0.91	none	--	[71]
1:5	ECe = (EC1:5)(Q1:5/Qe)	--	sample	Q1:5 can be assessed as (500 + 6ADMC) for a 1:5 soil to water suspension (where ADMC is air dry moisture content expressed as kg/100 kg).	[61]
ECe	EC1:1 = 0.33(ECe) +0.06	--	Coarse	Specifically states they are not well calibrated & are a rough guide to interpretation only	[68]
ECe	EC1:1 = 0.33(ECe) +0.77	--	Medium	Specifically states they are not well calibrated & are a rough guide to interpretation only	[68]
ECe	EC1:1 = 0.375(ECe) +0.97	--	Fine	Specifically states they are not well calibrated & are a rough guide to interpretation only	[68]