Spatial Variability of Electrical Conductivity of Desert Soil Irrigated with Treated Wastewater: Implications for Irrigation Management

Table 7

Fitted semivariogram models nugget, total sill, range, nugget to sill ratio, residual sum of square (RSS), and 𝑅² value of EC_1:1 at 0–20 cm depth during 2009 (best fitted model is in bold).

Model	Nugget	Total sill	Range (m)	Nugget : sill ratio	RSS	𝑅^2
Spherical	4.38	11.29	38	0.38	15.6	0.81
Exponential	3.37	12.09	306	0.28	14.1	0.82
Gaussian	5.09	10.96	145	0.46	18.4	0.77
Linear	5.06	12.05	—	0.41	17.5	0.78