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Category Text Publication
Reference Category Journals
DOI 10.1016/j.scitotenv.2024.170643
Licence creative commons licence
Title (Primary) Nitrogen-fertilizer addition to an agricultural soil enhances biogenic non-extractable residue formation from 2-13C,15N-glyphosate
Author Aslam, S.; Nowak, K.M.
Source Titel Science of the Total Environment
Year 2024
Department TECH; MEB
Volume 918
Page From art. 170643
Language englisch
Topic T7 Bioeconomy
Keywords Ammonium nitrate; Superphosphate; Microbial degradation; Non-extractable residues; Amino acids
Abstract Glyphosate and nitrogen (N) or (P) phosphorus fertilizers are often applied in combination to agricultural fields. The additional P or N supply to microorganisms might drive glyphosate degradation towards the sarcosine/glycine or the aminomethylphosphonic acid (AMPA), and consequently determine the speciation of non-extractable residues (NERs): harmless biogenic NERs (bioNERs) or potentially hazardous xenobiotic NERs (xenoNERs). We therefore investigated the effect of P or N-fertilizers on microbial degradation of glyphosate and bioNER formation in an agricultural soil. Four different treatments were incubated at 20 °C for 75 days as follows; I: no fertilizer (2-13C,15N-glyphosate only, control), II: P-fertilizer (superphosphate + 2-13C,15N-glyphosate, effect of P-supply), III: N-fertilizer (ammonium nitrate + 2-13C,15N-glyphosate, effect of N-supply) and IV: 15N-fertilizer (15N-ammonium nitrate + 2-13C-glyphosate, differentiation between microbial assimilations of 15N: 15N-fertilizer versus 15N-glyphosate). We quantified 13C or 15N in mineralization, extractable residues, NERs and in amino acids (AAs). At the end, mineralization (36–41 % of the 13C), extractable 13C,15N-glyphosate/2-13C-glyphosate (0.42–0.49 %) & 15N-AMPA (1.2 %), and 13C/15N-NERs (40–43 % of the 13C, 40–50 % of the 15N) were comparable among treatments. Contrastingly, the 15N-NERs from 15N-fertlizer amounted to only 6.6 % of the 15N. Notably, N-fertilizer promoted an incorporation of 13C/15N from 13C,15N-glyphosate into AAs and thus the formation of 13C/15N-bioNERs. The 13C/15N-AAs were as follows: 16–21 % (N-fertilizer) > 11–13 % (control) > 7.2–7.3 % (P-fertilizer) of the initially added isotope. 2-13C,15N-glyphosate was degraded via the sarcosine/glycine and AMPA simultaneously in all treatments, regardless of the treatment type. The percentage share of bioNERs within the NERs in the N-fertilized soil was highest (13C: 80–82 %, 15N: 100 %) compared to 53 % (13C & 15N, control) and to only 30 % (13C & 15N, P-fertilizer). We thus concluded simultaneous N & glyphosate addition to soils could be beneficial for the environment due to the major bioNER formation, while P & glyphosate application disadvantageous since it promoted xenoNER formation.
Persistent UFZ Identifier
Aslam, S., Nowak, K.M. (2024):
Nitrogen-fertilizer addition to an agricultural soil enhances biogenic non-extractable residue formation from 2-13C,15N-glyphosate
Sci. Total Environ. 918 , art. 170643 10.1016/j.scitotenv.2024.170643