Table 1 Descriptive statistics of soil properties and PXRF-quantified elements in Amarillo, Hobbs, Lubbock and Midland (N = 200).

Variable	Range	Min.	Max.	Mean	Std. Deviation	Variance	Skewness	Kurtosis	CV
pH	1.38	6.97	8.35	7.72	0.39	0.15	−0.39	−1.15	0.050
EC	3692.00	198.00	3890.00	1313.18	1027.96	1056700.39	1.07	−0.48	0.783
Zn	314.00	7.00	321.00	58.09	45.17	2040.29	1.66	5.57	0.778
K	1.59	0.37	1.96	1.12	0.45	0.20	0.02	−1.38	0.404
Ca	14.75	0.20	14.95	3.10	2.90	8.43	1.41	1.86	0.936
Ti	0.28	0.05	0.33	0.17	0.08	0.01	0.23	−1.16	0.457
V	70.00	8.00	78.00	36.33	18.99	360.46	0.25	−1.21	0.523
Mn	471.00	26.00	497.00	188.40	114.48	13106.49	0.43	−0.63	0.608
Fe	2.34	0.24	2.58	1.05	0.58	0.33	0.45	−0.68	0.549
Rb	81.70	17.30	99.00	50.32	22.32	497.97	0.20	−1.18	0.444
Sr	536.70	22.300	559.00	198.54	131.44	17277.32	0.63	0.02	0.662
Zr	543.00	127.00	670.00	339.95	135.34	18316.96	0.62	−0.68	0.398

N: Sample numbers. Unit of every variable: EC (dS m⁻¹), Zn (mg kg⁻¹), K (%), Ca (%), Ti (%),V (mg kg⁻¹), Mn (mg kg⁻¹), Fe (%), Rb (mg kg⁻¹), Sr (mg kg⁻¹), Zr (mg kg⁻¹).

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