Abstract
Atrazine is one of the most used herbicides worldwide; however, consequences of its long-term agricultural use are still unknown. A laboratory study was performed to examine changes in microbial properties following ethylamino-15N-atrazine addition, at recommended agronomic dose, to five acidic soils from Galicia (NW Spain) showing different physico-chemical characteristics, as well as atrazine application history. Net N mineralization was observed in all soils, with nitrate being the predominant substance formed. The highest values were detected in soils with low atrazine application history. From 2% to 23% of the atrazine-15N was found in the soil inorganic-N pool, the highest values being detected after 9 weeks in soils with longer atrazine application history and lower indigenous soil N mineralization. The application of atrazine slightly reduced the amount of soil N mineralized and microbial biomass at short term. Soluble carbohydrates and β-glucosidase and urease activity decreased with incubation time, but were not significantly affected by the single application of atrazine. Microbial community structure changed as consequence of both soil type and incubation time, but no changes in the phospholipid fatty acid (PLFA) pattern were detected due to recent atrazine addition at normal doses. The saturated 17- to 20-carbon fatty acids had higher relative abundance in soils with a longer atrazine history and fungal biomass, as indicated by the PLFA 18:2ω6,9, decreased with the incubation time. The results suggested that the PLFA pattern and soil N dynamics can detect the long-term impact of repeated atrazine application to agricultural soils.
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Acknowledgments
The authors thank Marcos Godoy Iglesias for the technical assistance. This study was supported by the Secretaría Xeral de Investigación e Desenvolvemento da Xunta de Galicia (Project PGIDT01PXI40002PR) and by Spanish Ministerio de Ciencia y Tecnología (Project AGL2005-05726-C02-01).
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Mahía, J., González-Prieto, S.J., Martín, A. et al. Biochemical properties and microbial community structure of five different soils after atrazine addition. Biol Fertil Soils 47, 577–589 (2011). https://doi.org/10.1007/s00374-011-0569-x
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DOI: https://doi.org/10.1007/s00374-011-0569-x