Temperature Effects on Phosphorus Release from a Biosolids-Amended Soil
Table 4
Soil P distributions among the various fractions at the beginning () and after 90 days of incubation (90 d).
Biosolids
Soil P fractions1
H2O
KCl
NaOHP0
HCl
Residual
T
0
90
T
0
90 d
T
0
90 d
T
0
90 d
T
0
90 d
T
0
90 d
Average P concentration (mg kg−1)
Control
9.5 (0.9)3
8.1 (0.7)
2.7 (0.2)
3.7 (0.3)
760 (68)
726 (61)
67 (6.0)
95 (8.0)
68 (6.0)
43 (3.6)
210 (19)
311 (26)
ATAD
45 (3.8)
14 (1.1)
3.9 (0.3)
10 (0.9)
683 (57)
799 (67)
66 (5.5)
72 (6.0)
71 (6.0)
46 (3.8)
320 (27)
249 (21)
OC East Cake
57 (4.3)
15 (1.1)
8.9 (0.7)
10 (0.8)
779 (59)
773 (59)
78 (6.0)
71 (5.3)
79 (6.0)
48 (3.7)
315 (24)
400 (30)
JEA Cake
18 (1.6)
7.4 (0.7)
3.3 (0.3)
6.3 (0.5)
764 (67)
763 (67)
51 (4.5)
73 (6.4)
90 (7.9)
48 (4.2)
214 (19)
242 (21)
Tampa
12 (1.0)
9.6 (0.8)
4.5 (0.4)
7.3 (0.6)
783 (65)
775 (65)
74 (6.2)
454 (3.8)
89 (7.5)
53 (4.4)
234 (19)
307 (26)
WPB
21 (1.8)
13 (1.1)
5.5 (0.5)
6.5 (0.5)
775 (65)
794 (66)
70 (5.9)
78 (6.5)
79 (6.6)
56 (4.7)
243 (20)
246 (21)
OC South Cake
27 (2.2)
12 (1.0)
6.9 (0.6)
9.3 (0.8)
761 (62)
762 (62)
77 (6.3)
56 (4.5)
83 (6.8)
48 (3.9)
271 (22)
339 (28)
Disney
15 (1.2)
9.5 (0.8)
3.3 (0.3)
5.4 (0.4)
786 (63)
853 (69)
35 (2.8)
63 (5.1)
86 (6.9)
55 (4.4)
319 (26)
257 (21)
TSP
39 (3.3)
16 (1.4)
6.2 (0.5)
6.8 (0.6)
739 (62)
823 (74)
54 (4.5)
67 (6.0)
74 (6.2)
49 (4.4)
276 (23)
156 (14)
H2O and KCl represent water-soluble and exchangeable P fractions, respectively; and NaOHP0 represent the Al- and Fe-bound inorganic and organic P; HCl is Ca-bound P; Residual is mineral-associated inorganic P. Values represent average P concentration of samples incubated at 20°C and 32°C. Data in parenthesis are % of total P.
