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

Table 8

Fitted semivariogram models nugget, total sill, range, nugget to sill ratio, residual sum of square (RSS), and 𝑅²R value of EC_1:1 at 20–40 cm depth during 2009 (best fitted model is in bold).

Model	Nugget	Total sill	Range (m)	Nugget : sill ratio	RSS	𝑅^2
Spherical	0.96	3.93	27	0.24	4.62	0.55
Exponential	0.45	4.01	202	0.11	4.78	0.54
Gaussian	1.50	3.94	61	0.31	4.48	0.57
Linear	2.66	4.52	—	0.57	5.89	0.43