Enhancing the Phytoremediation of Hydrocarbon-Contaminated Soils in the Sudd Wetlands, South Sudan, Using Organic Manure
Table 2
Physical and chemical characteristics of the soil used for the greenhouse experiment.
Parameters
Sand
Clay
Silt
STC
pH
P
TN
SOC
CEC
K
Na
Mg
Ca
Units
(%)
(H2O)
mg/kg
(%)
(cmol(+)/kg soil)
Test value
24.2
61.3
14.5
Clay
6.71
15.64
0.27
5.01
26.6
1.69
0.94
1.25
9.92
Critical valuea
—
—
—
—
5.5
15
0.2
3
25
0.5
<1.0
0.6
10
Source: Ruley et al. [35]. STC: soil texture class; SOC: soil organic carbon; CEC: cation-exchange capacity; acritical value according to Okalebo et al. [36] for most crops in East Africa.
