Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 507014
Title Persistence of glyphosate and aminomethylphosphonic acid in loess soil under different combinations of temperature, soil moisture and light/darkness
Author(s) Martins Bento, Celia; Yang, Xiaomei; Gort, Gerrit; Xue, Sha; Dam, Ruud van; Zomer, Paul; Mol, Hans G.J.; Ritsema, Coen J.; Geissen, Violette
Source Science of the Total Environment 572 (2016). - ISSN 0048-9697 - p. 301 - 311.
DOI https://doi.org/10.1016/j.scitotenv.2016.07.215
Department(s) Soil Physics and Land Management
RIKILT - Business unit Contaminants & Toxins
Biometris (WU MAT)
PE&RC
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Aminomethylphosphonic acid - AMPA - Dissipation - Glyphosate - Kinetic models - Loess soil
Abstract

The dissipation kinetics of glyphosate and its metabolite aminomethylphosphonic acid (AMPA) were studied in loess soil, under biotic and abiotic conditions, as affected by temperature, soil moisture (SM) and light/darkness. Nonsterile and sterile soil samples were spiked with 16 mg kg− 1 of glyphosate, subjected to three SM contents (20% WHC, 60% WHC, saturation), and incubated for 30 days at 5 °C and 30 °C, under dark and light regimes. Glyphosate and AMPA dissipation kinetics were fit to single-first-order (SFO) or first-order-multicompartment (FOMC) models, per treatment combination. AMPA kinetic model included both the formation and decline phases. Glyphosate dissipation kinetics followed SFO at 5 °C, but FOMC at 30 °C. AMPA followed SFO dissipation kinetics for all treatments. Glyphosate and AMPA dissipation occurred mostly by microbial activity. Abiotic processes played a negligible role for both compounds. Under biotic conditions, glyphosate dissipation and AMPA formation/dissipation were primarily affected by temperature, but also by SM. Light regimes didn't play a significant role. Glyphosate DT50 varied between 1.5 and 53.5 days, while its DT90 varied between 8.0 and 280 days, depending on the treatment. AMPA persisted longer in soil than glyphosate, with its DT50 at 30 °C ranging between 26.4 and 44.5 days, and its DT90 between 87.8 and 148 days. The shortest DT50/DT90 values for both compounds occurred at 30 °C and under optimal/saturated moisture conditions, while the largest occurred at 5 °C and reaching drought stress conditions. Based on these results, we conclude that glyphosate and AMPA dissipate rapidly under warm and rainy climate conditions. However, repeated glyphosate applications in fallows or winter crops in countries where cold and dry winters normally occur could lead to on-site soil pollution, with consequent potential risks to the environment and human health. To our knowledge, this study is the first evaluating the combined effect of temperature, soil moisture and light/dark conditions on AMPA formation/dissipation kinetics and behaviour.

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