Influence of Stabilized Biosolids Application on Availability of Phosphorus, Copper, and Zinc
Table 6
Effect of sewage sludge and stabilized sewage sludge on the DTPA-extractable zinc in relation to soil type, sewage source, mixing rate, and incubation period.
Treatments
Fluvial soil
Calcareous soil
SS1
SS2
SS1
SS2
30 day
60 day
30 day
60 day
30 day
60 day
30 day
60 day
Mixing rate, 10%
C
1.21f
1.20e
1.21d
1.20e
2.18e
2.16e
2.18f
2.16e
SS
8.46ab
8.11a
9.57a
7.80b
10.50a
8.84a
10.10a
9.15a
SS + CFA
7.77bcd
6.40c
7.46bc
6.39cd
9.02b
6.51cd
9.46bc
7.79b
SS + B
7.49cde
7.36ab
7.56bc
7.46b
6.24a
7.13bc
8.63d
7.60bc
SS + SBFL
8.15abc
6.49c
7.59bc
6.68cd
7.57c
8.10a
8.78d
7.81b
SS + CaCO3
7.19de
6.63bc
7.57bc
6.85c
7.76c
7.32b
8.89cd
6.72cd
SS + WH
7.15de
6.18c
7.37c
6.07d
7.22c
6.69bcd
6.87e
6.49d
SS + RS
6.78e
5.35d
8.14b
7.72b
7.54c
6.01d
9.04bcd
7.96b
SS + CS
8.89a
7.33ab
7.85bc
8.60a
8.62b
8.19a
9.66ab
9.70a
Mixing rate, 25%
C
1.21c
1.20e
1.21e
1.20f
2.18e
2.16f
2.18d
2.16 g
SS
8.46a
8.11a
9.57a
7.80a
10.5a
8.84b
10.10a
9.15a
SS + CFA
7.24ab
5.77cd
7.50bc
7.14bc
8.36bc
7.24d
7.92bc
7.39de
SS + B
6.86ab
5.64cd
7.28c
7.31b
7.72bcd
7.99c
8.75b
7.87bcd
SS + SBFL
7.33ab
6.70b
8.00b
7.34b
7.12cd
8.22c
7.98bc
7.54cde
SS + CaCO3
6.12b
8.00a
7.37bc
6.28d
8.17bc
7.34d
8.64b
6.00f
SS + WH
6.66b
6.29bc
5.99d
5.80e
6.52d
5.73e
7.20c
6.90e
SS + RS
6.66b
4.83d
9.17a
7.49ab
7.17cd
6.25e
9.74a
8.33abc
SS + CS
7.56ab
7.88a
8.92a
6.88c
8.71b
9.64a
9.95a
8.73ab
Values accompanied by different letters are significantly different within column ().