Salt concentrations and electrochemical properties in soil solution (saturation extracts) from a defunct LABR site. The proportions of samples exceeding recommended values are presented in brackets.

Table 1: Salt concentrations and electrochemical properties in soil solution (saturation extracts) from a defunct LABR site. The proportions of samples exceeding recommended values are presented in brackets.

Variable	Recommended	Value in soil	Variable	Recommended	Value in soil (mg L^-1)
pH	6.5-7.0	6.0-9.4(68%)^a	Mg²⁺	See PAR and SAR	0-119
EC (dS m^-1)	< 4	0.3-65.3(56%)^a	Cl^-	< 10 mg L^-1	44.3-8.050(47%)^a
ORP (mV)	-	212-374	CO₃^2-	-	0-552
PO₄^3- (mg L^-1)	-	4.1-7.2	HCO₃^-	-	0-420
SO₄^2- (mg L^-1)	57	88-47.130(100%)^a	Na⁺	SAR < 12	74-33.101(94%)^b
Ca²⁺ (mg L^-1)	See PAR and SAR	1-178	K⁺	PAR = 6-8	2-256(100%)^c

n = 34, terrain surface = 1024 m².

EC: Electrical conductivity.

ORP: Oxidation reduction potential

SAR: Sodium adsorption ratio.

PAR: Potassium adsorption ratio.

^aPercentage of samples above the average in soil solution according to normal values presented by Marschner and Rengel [24].

^bPercentage of samples above the maximum recommended SAR value [31].

^cPercentage of samples outside the recommended PAR value [25].