Constituent
Unit
Biosolids application rate (Mg dry biosolids ha-1)
0
22
22
45
67
Control
25-year
8-year
8-year
8-year
pH (1:10)
7.7
7.4
7.4
7.4
7.2
Bulk density
g∙cm−3
1.5
1.5
1.5
1.5
1.5
Total SOC
mg∙kg−1
31.4
45.7
41.8
48.1
59.8
H3A extractable P
mg∙kg−1
5.7
73.3
30.4
39.0
46.3
Water soluble P
mg∙kg−1
2.0
12.1
7.7
6.7
6.2
Total N
mg∙kg−1
3.0
4.6
3.8
5.6
9.1
Total C:N
10.4
9.9
11.6
8.7
6.5
Water soluble OC
kg∙ha−1
545.0
521.0
534.0
483.0
555.0
Water soluble ON
kg∙ha−1
37.7
45.9
55.0
143.5
165.4
Soluble organic C:N
14.5
11.6
9.8
3.4
4.8
kg∙ha−1
7.5
7.9
84.0
10.0
12.6
kg∙ha−1
11.1
55.9
71.4
374.7
573.6
Inorganic N
kg∙ha−1
18.6
63.8
79.8
384.7
586.2
Total soluble N
kg∙ha−1
56.3
109.7
134.8
528.2
751.7
Total soluble C:N
9.7
4.7
4.1
0.9
0.7
1-day CO2-C production
mg CO2-C kg−1
47.7
64.5
47.1
53.4
61.5