Using Multivariate Geostatistics to Assess Patterns of Spatial Dependence of Apparent Soil Electrical Conductivity and Selected Soil Properties

Table 4

Linear correlation matrix between the continuously recorded EC_a data sets and the soil properties analyzed.

		14/03/2008		03/04/2008		23/06/2008
								ECe	Clay	Silt	Sand
14/03/2008		1.000
14/03/2008		0.780	1.000
03/04/2008		0.972	0.759	1.000
03/04/2008		0.724	0.796	0.792	1.000
23/06/2008		0.861	0.729	0.855	0.688	1.000
23/06/2008		0.541	0.644	0.515	0.569	0.751	1.000
23/06/2008	ECe	0.127	0.185	−0.012	−0.141	0.156	0.224	1.000
23/06/2008	Clay	0.344	0.495	0.252	0.197	0.253	0.346	0.221	1.000
23/06/2008	Silt	−0.247	−0.423	−0.172	−0.216	−0.137	−0.228	−0.145	−0.773	1.000
23/06/2008	Sand	−0.086	−0.012	−0.076	0.065	−0.133	−0.119	−0.076	−0.170	−0.494	1.000
23/06/2008		*	*	*	*	0.685	0.648	0.005	0.221	−0.145	−0.075	1.000

Values were excluded in linear correlation analysis because the soil water content was only measured on 23/6/2006 and for this reason the coefficients of correlation were not calculated between soil water content and apparent electrical conductivity of the soil (EC_a-V and EC_a-H) for other sampling dates (14/3/2008 and 03/4/2008).
^**To correlate the measurement of and for the measurement dates (14/3/2008 and 3/4/2008) with the measurements made on 23/6/2008, it was necessary to estimate the measurements of , EC_e, clay, silt, and sand content using kriging in locations measured on 23/6/2008.