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International Journal of Basic Science and Technology

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Archive | ISSUE: , Volume: Apr-Jun-2025

Effect of Soil pH on Fungal Community Dynamics and Biodegradation of Dimepax and Primextra in Loamy Sand Soil


Author:Eseigbe et al., 2025

published date:2025-Jun-18

FULL TEXT in - | page 146 - 158

Abstract

Soil contamination with herbicides such as Dimepax and Primextra poses a threat to agricultural sustainability and environmental health. Indigenous soil fungi have shown potential for biodegradation of such pollutants, but their activity is often modulated by soil physicochemical factors, notably pH. This study investigates the influence of soil pH on the diversity and dynamics of fungal communities during the biodegradation of Dimepax and Primextra in loamy sand soils. Soil samples of varying pH (6.4, 6.8, 7.7) were collected and analyzed for indigenous microbial composition before herbicide application. Biodegradation experiments spanned 30 days, during which fungal propagule counts were measured at 1, 10, 20, and 30 days following herbicide application. Fungal isolates were identified morphologically and quantified via CFU counts. Initial microbial assessments revealed a diverse fungal community, with Aspergillus, Penicillium, Fusarium, and Rhizopus spp. present across all soil pH levels. Herbicide application induced dynamic shifts in fungal abundance, with optimal biodegradation activity generally observed at neutral to slightly alkaline pH (6.8–7.7). Over time, key fungal species such as A. niger, A. tamari, P. notatum, and Fusarium sp. exhibited substantial increases in propagule counts, suggesting active participation in herbicide degradation. Actinomycetes emerged at later stages, indicating potential fungal-bacterial synergy. Soil pH significantly influences fungal community structure and herbicide biodegradation potential. The resilience and activity of indigenous fungi in neutral to slightly alkaline soils highlight their promise for bioremediation of herbicide-contaminated soils, particularly in environments with neutral to slightly alkaline pH conditions. Optimization of soil conditions could further enhance the effectiveness of fungal-based bioremediation strategies.

Keywords: Fusarium sp, Loamy sand, Dimepax, Primextra, Soil pH

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