Applied and Environmental Soil Science / 2012 / Article / Tab 2

Research Article

Influence of Stabilized Biosolids Application on Availability of Phosphorus, Copper, and Zinc

Table 2

Selected characteristics and metal concentrations in the studied soils and sewage sludge.

Soil classification
Tested characteristicsCalcareous soilFluvial soilSewage sludge (SS1)Sewage sludge (SS2)
Typic TorrifluventsTypic Calcorthids

Tested basic characteristics
 pH7.827.716.285.86
 EC, dSm−10.940.553.903.80
 OM, g kg−114.9022.20144.50149.20
 CEC, cmol(+)/kg12.6334.1035.8036.30
 CaCO3, %28.505.3015.209.88
 Olsen-P, mg kg−18.707.7053.9057.30

Particle size distribution, %
 Sand53.5818.52
 Silt28.7256.30
 Clay17.7025.18
 Texture classSandy clay loamSilty loam

DTPA-extracted elements, mg kg−1
 Zn2.181.21
 Cu3.104.26
 Pb1.252.18
 Ni0.240.45
 Cd0.020.02

Aqua-regia-extracted elements, mg kg−1
 Fe18250.5055724.0030260.0039907.50
 Mn331.50779.00723.00251.00
 Zn57.20111.801437.201218.10
 Cu24.5056.10158.80148.90
 Cd1.501.151.451.40
 Ni23.1060.0034.1041.90
 Pb46.5063.50193.00120.50

EC: electric conductivity (dSm−1); OM: organic matter; CEC: cation exchange capacity (cmol(+)/kg); (—): not measured; DTPA: diethylenetriaminepenta-acetic acid.