Using Soil Apparent Electrical Conductivity to Optimize Sampling of Soil Penetration Resistance and to Improve the Estimations of Spatial Patterns of Soil Compaction

Table 3

Fitted models and variogram parameters for all the variables measured by EM38 and VERIS P3000.

Variable	Geostatistical analysis	Model			(m)
	Universal kriging	Spherical	0.001	0.01	130.00
	Universal kriging	Spherical	0.001	0.005	130.00
	Universal kriging	Pure nugget effect
	Universal kriging	Pure nugget effect
	Universal kriging	Pure nugget effect
	Universal kriging	Pure nugget effect
	Universal kriging	Pure nugget effect
	Universal kriging	Pure nugget effect
	Universal kriging	Pure nugget effect
	Universal kriging	Pure nugget effect
	Universal kriging	Pure nugget effect
	Universal kriging	Pure nugget effect
	Universal kriging	Spherical	0.01	0.10	50.00
	Universal kriging	Spherical	0.00	0.045	90.00
	Universal kriging	Spherical	0.00	0.014	125.00
	Universal kriging	Spherical	0.00	0.011	120.00
	Universal kriging	Spherical	0.00	0.011	90.00
	Universal kriging	Spherical	0.00	0.017	100.00
	Universal kriging	Pure nugget effect
	Universal kriging	Pure nugget effect
	Universal kriging	Pure nugget effect
	Universal kriging	Pure nugget effect
	Universal kriging	Spherical	0.00	0.015	130.00
	Universal kriging	Spherical	0.00	0.0095	70.00

: pure nugget effect; : structural variance; : range.