Effect of chemical remediation of crude-oil polluted agricultural land on soil properties and crop performance
Chemical degreaser with detergent was. used to wash crude-oil polluted agricultural soil and restore it to 83% -93% of the unpolluted soil's status for sustainable productivity. Comparison of reclaimed soil's properties with unpolluted soil sample of the same area indicated no significant differences (p=0.05) between their values for soil moisture content, soil pH, evapotranspiration, root elongation and soil fertility. Root elongation at 1.1 cm/day in the reclaimed soil compared with 1.29 cm/day in unpolluted soil indjcated 83% recovery. Saturated hydraulic conductivity alsp had ·83% recovery. However, infiltration rate showed a low recovery of 30.%, perhaps, due to the wetness of the reclaimed soil's surface . prior· to the reclamation process. The soil · macro/microspores were unblocked by the degreaser enabling the root pores to overcome the osmotic problem caused by oil-molecules' blockade and conduct moisture through to the phloem and. leaves to sustain evapotranspiration, leaves turgidity and plant health. The chemical reclamation by degreaser with detergent is highly recommended for short-duration in-situ remediation of crude-oil polluted agricultural land.
Keywords: crude-oil degradation soil, agricultural land, chemical remediation, degreaser/detergent, crop performance.
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