Improving Soil Simazine Dissipation Through an Organic Amendment Inoculated with Trametes versicolor

Abstract

The aim of this research was to investigate the effect of applying sewage sludge combined with wheat crop residue as an organic amendment on the dissipation rate of simazine spiked at 2 and 20 mg kg −1 in an Andisol soil from southern Chile. Changes in some soil enzymes related to soil quality were measured by spectrophotometry, simazine dissipation rates were measured by gas chromatography, and biomass production in the contaminated soil was evaluated. Results of this study indicated that application of the organic amendment inoculated with Trametes versicolor enabled a decrease in negative effects of the herbicide on soil enzymatic activities and a reduction in final concentrations of simazine (~80% at both doses). The simazine half-life time was reduced from 14 to 10 days and from 36 to 15 days for doses of 2 and 20 mg kg −1 , respectively. These findings prove that the combined strategy of biostimulation and bioaugmentation using these residues can be effectively used to reduce residue pesticides in soils, mainly by increasing the microbiological activity, thus improving simazine dissipation in an Andisol soil.

Aspergillus tubingensis and Talaromyces islandicus Solubilize Rock Phosphate Under Saline and Fungicide Stress and Improve Zea mays Growth and Phosphorus Nutrition

“…The occurrence of xenobiotics in soils is an increasing concern as they exert toxicity on non-target organisms, compromising microbial functions like nutrient cycling. Fungicides, herbicides, and insecticides are widely used to support the agricultural production; however, their effects on beneficial soil microorganisms must be assessed (Herrera et al 2019;Tortella et al 2019), given that the tolerance to pesticides is an important step screening efficient PSMs. In this study, the P-solubilizing capabilities of A. tubingensis and T. islandicus were gradually affected when exposed to fungicides (Table 2).…”

“…The performance of beneficial microorganisms could be limited in stressful environments, when their capacity to establish, multiply, and spread through the soil is affected. In this respect, it is accepted that the solubilizing capability depends on the physical and chemical properties of soil, which are influenced by factors such as the salinity, temperature, element content, and xenobiotics (Herrera et al 2019;Boroumand et al 2020). However, some PSMs have been reported to tolerate different levels of abiotic stress and preserve their solubilizing activity.…”

Inoculation of Triticum Aestivum L. (Poaceae) with Plant-Growth-Promoting Fungi Alleviates Plant Oxidative Stress and Enhances Phenanthrene Dissipation in Soil

“…Manganese peroxidase (MnP) activity was measured by mixing 1 g of soil, 2.0 mL of sodium tartrate (0.1 M pH 5.0), 2.0 mL of H 2 O 2 (0.1 mM), and 2.0 mL of MnSO 4 (0.1 mM). Samples were incubated at 25 • C for 30 min and measured by spectrophotometry at an absorbance of 420 nm [10] in a BK-UV1800 spectrophotometer (Biobase).…”

“…Soil microorganisms can contribute to the degradation of organic pollutants because they can sequester organic and inorganic compounds, produce plant-growth promoting metabolites, and contribute to increase nutrient availability, among others [9][10][11]. Recent studies have demonstrated that soil fungi can improve PAH dissipation rates from different soils [12][13][14].…”

Isolation of 2 simazine-degrading bacteria and development of a microbial agent for bioremediation of simazine pollution

“…Bioaugmen tation with pure cultures or microbial consortia was an attractive option for removing simazine or other s-triazine herbicides from the contaminated sites (Hernandez et al 2010, Zhu et al 2021, Herrera et al 2019. In general, in order to ens ure the effect of bioaugmentation, it was necessary to prepare an effi cient microbial agent which was easy to store and use.…”