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Table 3 Correlation matrix of the major oxides in the studied agricultural soils

From: Geochemical characteristics of agricultural soils, Assiut governorate, Egypt

 

Sand

Silt

Clay

CaCO3%

CaSO4%

SiO2

Al2O3

Fe2O3

CaO

MgO

TiO2

K2O

Na2O

P2O5

SO3

Cl

LOI

Sand

1

                

Silt

− .98**

1

               

Clay

− .88**

.78**

1

              

CaCO3

− 0.02

0.10

− 0.19

1

             

CaSO4

− 0.30

0.29

0.35

− 0.15

1

            

SiO2

.77**

− 0.77**

− 0.67**

− 0.12

− 0.40

1

           

Al2O3

− .73**

0.72**

0.64**

0.02

0.06

− 0.81**

1

          

Fe2O3

− .65**

0.64**

0.57*

0.09

0.15

− 0.85**

0.96**

1

         

CaO

0.32

− 0.33

− 0.25

0.11

0.28

− 0.06

− 0.45

− 0.33

1

        

MgO

− .72**

0.73**

0.56*

0.20

− 0.01

− 0.87**

0.87**

0.85**

− 0.20

1

       

TiO2

− .56*

0.56*

0.48

0.12

− 0.01

− 0.78**

0.92**

0.95**

− 0.30

.85**

1

      

K2O

0.09

− 0.08

− 0.09

0.06

− 0.10

− 0.19

0.33

0.44

− 0.12

0.15

0.32

1

     

Na2O

− 0.47

0.47

0.39

0.23

0.20

− 0.74**

0.57*

.67**

0.02

0.74**

0.60

0.18

1

    

P2O5

0.03

− 0.06

0.04

− 0.18

0.43

0.12

− 0.26

− 0.22

0.17

− 0.30

− 0.19

− 0.29

− 0.19

1

   

SO3

− 0.07

0.03

0.19

− 0.23

0.70**

− 0.14

− 0.10

− 0.03

0.25

− 0.10

− 0.05

− 0.23

0.12

.82**

1

  

Cl

0.26

− 0.29

− 0.14

− 0.09

0.16

− 0.06

− 0.29

− 0.16

0.50*

− 0.04

− 0.22

0.10

0.49

− 0.07

0.20

1

 

LOI

− .88**

0.89**

0.69**

0.14

0.35

− .78**

0.54*

0.49

− 0.02

0.68**

0.38

− 0.12

0.49

− 0.22

− 0.08

− 0.04

1

  1. ** Correlation is significant at the 0.01 level (two-tailed). * Correlation is significant at the 0.05 level (two-tailed)