The impact of treated and untreated municipal wastewater on soil filamentous fungi
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Date
2022
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Université Abbes Laghrour -Khenchela-
Abstract
Abstract
The aim from this study is to investigate the effect of treated and untreated wastewater on the biodiversity of filamentous fungi in an agricultural soil planted with wheat. To evaluate the impact of wastewater on soil filamentous fungi communities, we isolated and identified species in treated and untreated municipal wastewater before it is used for irrigation to examine the possibility of input of exogenous filamentous fungi. Our experiment was carried out with 5 groups: Soil irrigated with mineral water (control); Soil irrigated with untreated municipal wastewater; Soil irrigated with treated municipal water, also we isolated and identified species in treated and untreated municipal wastewater.
Overall, our results showed that untreated municipal wastewater did not add any exogenous filamentous fungi to the soil. In the control group, where the soil was irrigated with distilled water, we identified five taxa: Micor sp, Aspergillus niger, Alternaria sp, Pythium dissimile, and Geomyces sp. The same taxa were found in soil irrigated with untreated municipal wastewater, but the genus Geomyces sp was not found. However, in sol irrigated with treated municipal wastewater, we identified six taxa; four of them were observed in control soil; Micor sp, Aspergillus niger, Alternaria sp, Pythium sp, and the other two: Rhizopus nigricans and Absidia sp were not.
Our results demonstrate that the irrigation with untreated wastewater has no impact on the diversity of filamentous fungi in agricultural soils in the region of Tébessa. The soil already seems poor in filamentous fungi and also poor in organic matter, indicating that these soils could not be fertile. Farmers must work hard to correct the structure and texture of these soils by adding organic matter and crop rotation and cultivating the soil with other crops besides wheat