The Scientific World Journal

Research Article

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

Table 2

Pearson’s coefficients of correlation matrix between the variables measured by EM38 and VERIS P3000 (**significant for < 0.05; *significant for < 0.1).
 ECa-VECa-H
ECa-V1            
ECa-H0.75**1           
−0.36*−0.44**1          
−0.5**−0.56**0.66**1         
−0.6**−0.59**0.41**0.85**1        
−0.7**−0.53** 0.74**0.79**1       
−0.45**  0.74**0.74**0.73**1      
−0.52**−0.44* 0.51** 0.47*0.63**1     
   0.61**   0.78**1    
−0.49*  0.48*    0.84**1   
−0.67**−0.62**0.57*0.68**    0.79**0.89**1  
−0.65**−0.62**0.64**0.95**0.91**0.87**0.74**0.48*0.46* 0.58**1 
−0.41*  0.71**0.6**0.63**0.86**0.81**0.95**0.92**0.87**0.65**1
0.51**0.35*  −0.37*   −0.56**−0.56*−0.55* −0.44**
0.54**0.51**−0.35*−0.41**−0.53**  −0.53**−0.64**−0.67**−0.67**−0.43**−0.46**
0.71**0.72**  −0.42**  −0.63**−0.63** −0.68**−0.39* 
0.75**0.78**  −0.47**−0.4* −0.57**−0.5* −0.66**−0.43** 
0.54**0.52** −0.46**−0.64**−0.49**−0.55**    −0.51**−0.5**
0.51**0.57** −0.46*−0.57**−0.49**−0.64**−0.6**  −0.52*−0.5**−0.54**
 0.45* −0.54**    −0.5* −0.79** −0.55**
          −0.63**  
             
0.67**0.61** −0.38*−0.53**  −0.58**−0.69**−0.68**−0.72**−0.43**−0.44**
0.57**0.53** −0.46**−0.57**−0.5**−0.61**−0.53**  −0.7**−0.49**−0.59**
   
ECa-V             
ECa-H             
             
             
             
             
             
             
             
             
             
             
             
1            
0.69**1           
0.6**0.71**1          
0.53**0.69**0.95**1         
 0.62**0.55**0.7**1        
 0.53**0.66**0.77**0.85**1       
 0.56**0.53**0.52**0.59**0.75**1      
 0.49*  0.55*0.68**0.93**1     
0.62*0.65*    0.71**0.87**1    
0.83**0.94**0.86**0.83**0.61**0.57**0.56** 0.66*1   
 0.53**0.47**0.61**0.89**0.96**0.9**0.9**0.72**0.55**1