Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1016/j.scitotenv.2018.12.195
Title (Primary) Effect of temperature, pH and total organic carbon variations on microbial turnover of 13C315N-glyphosate in agricultural soil
Author Muskus, A.M.; Krauss, M. ORCID logo ; Miltner, A. ORCID logo ; Hamer, U.; Nowak, K.M.
Source Titel Science of the Total Environment
Year 2019
Department UBT; WANA
Volume 658
Page From 697
Page To 707
Language englisch
Keywords Mineralization; AMPA; Amino acids; Biogenic non-extractable residues; NER
Abstract Glyphosate is the best-selling and the most-used broad-spectrum herbicide worldwide. Microbial conversion of glyphosate to CO2 and biogenic non-extractable residues (bioNER) leads to its complete degradation. The degradation of glyphosate may vary in different soils and it depends on environmental conditions and soil properties. To date, the influence of temperature, soil pH and total organic carbon (TOC) on microbial conversion of glyphosate to bioNER has not been investigated yet. The pH or TOC of an agricultural original soil (pH 6.6, TOC 2.1%) was modified using sulfuric acid or farmyard manure (FYM), respectively. Each treatment: original (I), 3% TOC (II), 4% TOC (III), pH 6.0 (IV) and pH 5.5 (V) was amended with 13C315N-glyphosate and incubated at 10 °C, 20 °C and 30 °C for 39 days. The temperature was the main factor controlling the mineralization and the extractable 13C315N-glyphosate, whereas higher TOC content and lower pH resulted in enhanced formation of 13C-bioNER. After 39 days the cumulative mineralization of 13C-glyphosate was in the range of 12–22% (10 °C), 37–47% (20 °C) and 43–54% (30 °C). Extractable residues of 13C-glyphosate were in the range of 10–21% (10 °C) and 4–10% (20 °C and 30 °C); whereas those of 15N-glyphosate were as follows 20–32% (10 °C) and 12–25% (20 °C and 30 °C). The 13C-NER comprised about 53–69% of 13C-mass balance in soils incubated at 10 °C, but 40–50% in soils incubated at 20 °C and 30 °C. The 15N-NER were higher than the 13C-NER and varied between 62% and 74% at 10 °C, between 53% and 81% at 20 °C and 30 °C. A major formation of 13C-bioNER (72–88% of 13C-NER) at 20 °C and 30 °C was noted in soil amended with FYM. An increased formation of 15N-bioNER (14–17% of 15N-NER) was also observed in FYM-amended soil. The xenobiotic 15N-NER had a major share within the 15N-NER and thus need to be considered when assessing the environmental risk of glyphosate-NER.
Persistent UFZ Identifier
Muskus, A.M., Krauss, M., Miltner, A., Hamer, U., Nowak, K.M. (2019):
Effect of temperature, pH and total organic carbon variations on microbial turnover of 13C315N-glyphosate in agricultural soil
Sci. Total Environ. 658 , 697 - 707 10.1016/j.scitotenv.2018.12.195