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

Table 10

Fitted semivariogram models, nugget, total sill, range, nugget to sill ratio, residual sum of square (RSS), and 𝑅²R value of EC at 20–40 cm depth during 2010 (best fitted model is in bold).

Model	Nugget	Total sill	Range (m)	Nugget : sill ratio	RSS	𝑅^2
Spherical	1.06	5.09	40	0.20	2.70	0.89
Exponential	0.60	5.69	290	0.10	2.54	0.90
Gaussian	1.60	5.08	136	0.31	3.55	0.86
Linear	1.69	5.71	—	0.29	4.56	0.82