Phosphorus Status, Inorganic Phosphorus Forms, and Other Physicochemical Properties of Acid Soils of Farta District, Northwestern Highlands of Ethiopia
Table 8
The linear correlation coefficients between the selected soil chemical properties.
Silt
Clay
pH
LR
Ex. Ca
Ex. Mg
Ex. Al
CECs
OC
Olsen P
Total P
Al-P
Fe-P
Ca-P
Alox
Feox
Pox
DPS
Ald
Clay
−0.74*
pH
0.29
−0.26
LR
−0.22
0.17
−0.98**
Ex. Ca
−0.30
0.53
−0.35
0.29
Ex. Mg
−0.36
0.57
−0.29
0.16
0.90**
Ex. Al
−0.13
0.23
−0.92**
0.92**
0.09
0.03
CECs
−0.21
0.43
−0.35
−0.34
0.97**
0.76*
0.11
OC
0.43
−0.59
0.08
0.05
0.15
−0.17
−0.22
0.34
Olsen P
0.21
−0.14
0.40
−0.45
−0.70
−0.48
−0.16
−0.79*
−0.44
Total P
0.55
−0.22
0.67
−0.70
−0.29
−0.21
−0.51
−0.32
0.44
0.67
Al-P
0.14
−0.03
0.42
0.47
−0.64
−0.48
−0.18
−0.72*
−0.39
0.98**
0.71*
Fe-P
0.24
−0.06
0.53
−0.57
−0.66
−0.47
−0.25
−0.73*
−0.45
0.96**
0.77*
0.97**
Ca-P
−0.28
0.22
0.71*
−0.68
−0.31
−0.36
−0.60
−0.30
−0.12
0.41
0.39
0.53
0.52
Alox
0.33
−0.04
0.44
−0.39
−0.06
−0.29
−0.31
−0.03
0.31
0.38
0.66
0.50
0.45
0.55
Feox
0.56
−0.39
0.24
−0.26
−0.64
−0.43
0.04
−0.70
−0.39
0.68
0.39
0.54
0.64
−0.07
0.07
Pox
0.04
0.05
0.27
−0.31
−0.65
−0.52
−0.01
−0.70
−0.44
0.94**
0.58
0.98**
0.93**
0.51
0.47
0.50
DPS
−0.11
0.14
0.17
−0.21
−0.63
−0.50
−0.07
−0.69
−0.49
0.89**
−0.45
0.93**
0.86**
0.51
0.37
0.40
0.98**
Ald
0.13
0.29
−0.21
0.24
0.78*
0.53
0.12
0.88**
0.40
−0.69
−0.06
−0.60
−0.55
−0.26
0.18
−0.51
−0.60
−0.63
Fed
0.18
0.04
0.08
−0.06
0.72*
0.59
−0.27
0.77*
0.43
−0.76*
−0.10
−0.75*
−0.64
−0.28
−0.09
−0.42
−0.84**
−0.89**
0.82*
* and ** = significant at 0.05 and 0.01 probability levels, respectively; LR = lime requirement; Ex. Ca = exchangeable Ca; Ex. Mg = exchangeable Mg; Ex. Al = exchangeable Al; CECs = cation exchange capacity of soil; OC = organic carbon; TP = total P; Al-P = Al bound P; Fe-P = iron bound P; Ca-P = calcium bound P; Alox, Feox, and Pox = oxalate extractable Al, Fe, and P, respectively; DPS = degree of P saturation; Ald and Fed = citrate dithionite bicarbonate extractable Al and Fe, respectively.
