Determination of exchangeable cations and residual concentration of herbicide treated soils and analysis of the in-vitro biodegradation of the herbicides

Yıl 2020, Cilt: 3 Sayı: 2, 49 - 63, 25.12.2020

Adewole Sebiomo

https://doi.org/10.38061/idunas.759008

Öz

This study determined the effect of Atrazine, Xtravest, Gramoxone and Glyphosate on exchangeable cations and also analysed the in-vitro biodegradation of this herbicides as well as assayed for their residual concentration in soils. Exchangeable Na+, Ca2+, K+, Mg2+, Fe2+and Zn+ were analysed in atomic absorption spectrophotometer. Utilisation of herbicides was determined using the method of Moneke, while herbicide degradation and residual concentration of herbicide were analysed using Gas Chromatography. K+, Ca2+, Mg2+, and Na+ declined while Fe2+ and Zn+ accumulated significantly. Bacteria and fungi significantly utilised herbicides as carbon source via increases in bacterial counts, optical density, fungal counts and fungal dry weights. Herbicides were significantly degraded by bacteria and fungi. Bacteria degraded herbicides faster compared to fungi. The lowest herbicide concentration of 118.55 ppm was obtained from atrazine inoculated with bacteria, while the highest herbicide concentration of 449.23 ppm was obtained from xtravest inoculated with fungi. Residual concentration of herbicides increased significantly (P<0.024). Bacteria and fungi such as: B. subtilis, P. aeruginosa, P. florescences, P. putida, Actinomyces viscous, A. niger, A. tamarii, F. oxysporum, and P. chrysogenum were isolated in all the herbicide treated soils. Continuous herbicide treatment should be avoided because of their ability to persist in soils hence limiting essential nutrients available to plants. Indigenous microorganisms can be employed to remediate soils polluted by herbicides.

Anahtar Kelimeler

Bacteria, Fungi, Herbicide, Concentration, Incubation

Kaynakça

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