EFFECTS OF THE 2, 4-DICHLOROPHENOXYACETIC ACID (2,4-D) HERBICIDE CONTAMINATION ON SOIL MICRO......

Because soil microorganisms rapidly decompose 2, 4-Dichlorophenoxyacetic Acid (2, 4-D), little or no scientific focus has been paid to improving its degradation as a type of environmental remediation. The potentials of organic and mineral fertilisers to boost microbial activity in soils under the impact of the 2, 4-D herbicide were investigated in a completely randomised design laboratory incubation experiment. Soil contaminated with 2, 4-D in the field was adjusted separately with compost and NPK mineral fertiliser, and the treated samples were incubated at room temperature for 56 days. To investigate responses of soil microorganisms at the community level of the treatments, soil microbiological parameters were measured in dynamics and eco-physiological quotients were computed at the end of the incubation period. Soil respiration and microbial biomass were increased when 2, 4-D was applied alone or in combination with fertiliser, independent of type. When NPK was added to the 2, 4-D polluted soil, the microbial metabolic quotient (qCO2) increased, however when compost was added, this parameter decreased. When compared to a single application of 2, 4-D herbicide, the addition of compost improved all eco-physiological quotients. As a result, it was concluded that while application of organic fertiliser at the field recommended rate has the potential to negatively impact the soil microbial community, accelerated degradation engendered by bio-stimulation of native microorganisms may help the soil regain its microbial competence.

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