Impact of glyphosate on soil microbial biomass and respiration: A meta-analysis

Nguyen, Duy Binh; Rose, Michael T.; Rose, Terry J.; Morris, Stephen; Zwieten, Lukas Van

doi:10.1016/j.soilbio.2015.09.014

Cited by 128 publications

(59 citation statements)

References 53 publications

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“…Further soil microbial properties were also measured (community structure measured by ester-linked fatty acid methyl ester (EL-FAME) analysis and microbial biomass K), and K fractions (exchangeable and nonexchangeable) were measured periodically. There were no significant effects of repeated glyphosate application on soil microbial structure (EL-FAME), functional diversity (EL-FAME), or microbial biomass K. Glyphosate was also found to not reduce exchangeable K (putatively available to plants) or to affect nonexchangeable K. A meta-analysis indicates that there is no observable trend in the literature for soil microbial biomass or respiration effects linked to glyphosate, other than transient effects after initial exposure [37]. The effects observed in the N-transformation study with AMPA at the 2 highest rates (320 mg/kg dry soil and 640 mg/kg dry soil), although not <25% at the final measurement day 56, should be placed into context with the application rates for glyphosate in the field.…”

Section: Soil Microbial Activitymentioning

confidence: 85%

Glyphosate and aminomethylphosphonic acid chronic risk assessment for soil biota

Mérey

Manson

Mehrsheikh

et al. 2016

Enviro Toxic and Chemistry

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Glyphosate is a broad-spectrum herbicide used widely in agriculture, horticulture, private gardens, and public infrastructure, where it is applied to areas such as roadsides, railway tracks, and parks to control the growth of weeds. The exposure risk from glyphosate and the primary soil metabolite aminomethylphosphonic acid (AMPA) on representative species of earthworms, springtails, and predatory soil mites and the effects on nitrogen-transformation processes by soil microorganisms were assessed under laboratory conditions based on internationally recognized guidelines. For earthworms, the reproductive no-observed-effect concentration (NOEC) was 472.8 mg glyphosate acid equivalent (a.e.)/kg dry soil, which was the highest concentration tested, and 198.1 mg/kg dry soil for AMPA. For predatory mites, the reproductive NOEC was 472.8 mg a.e./kg dry soil for glyphosate and 320 mg/kg dry soil for AMPA, the highest concentrations tested. For springtails, the reproductive NOEC was 472.8 mg a.e./kg dry soil for glyphosate and 315 mg/kg dry soil for AMPA, the highest concentrations tested. Soil nitrogen-transformation processes were unaffected by glyphosate and AMPA at 33.1 mg a.e./kg soil and 160 mg/kg soil, respectively. Comparison of these endpoints with worst-case soil concentrations expected for glyphosate (6.62 mg a.e./kg dry soil) and AMPA (6.18 mg/kg dry soil) for annual applications at the highest annual rate of 4.32 kg a.e./ha indicate very low likelihood of adverse effects on soil biota.

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Section: Soil Microbial Activitymentioning

confidence: 85%

Glyphosate and aminomethylphosphonic acid chronic risk assessment for soil biota

Mérey

Manson

Mehrsheikh

et al. 2016

Enviro Toxic and Chemistry

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“…An additional boosted regression tree (BRT) analysis was performed to rank the importance of the explanatory variables and address non-linearity and factor interactions (Elith et al, 2008). The combination between BRT and mixed-effect model has been used in a number of meta-analyses (Rose et al, 2014;Zhang et al, 2015;Nguyen et al, 2016).…”

Section: Boosted Regression Tree Analysismentioning

confidence: 99%

Effects of biochar on soil available inorganic nitrogen: A review and meta-analysis

et al. 2017

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The interaction between biochar and soil changes nitrogen (N) dynamics in different ecosystems.Although multiple studies have reported influences of biochar on soil inorganic N (SIN) including ammonium (NH 4 + -N) and nitrate (NO 3 --N), the influences reported are contradictory. We undertook a meta-analysis to investigate how biochar properties and the interaction among biochar, soil and fertilisation affect SIN. This quantitative analysis used 56 studies with 1080 experimental cases from manuscripts published between 2010 and 2015. Overall, we found that biochar reduced SIN regardless of experimental conditions (approximately -11±2% of NH 4 + -N and -10±1.6% of NO 3 --N); however, 95% of cases were observed within one year after biochar application. SIN was best explained by residence time of biochar in soil, pyrolysis temperature, application rate, fertiliser type, and soil pH. The effects of biochar were complex due to the interaction of biochar with environmental factors. Most biochar trials used wood as a feedstock, but woody biochar did not decrease SIN as much as other plant-derived biochars. When biochar was used with NH 4 -based fertilisers, SIN decreased compared to biochar with no fertiliser. In contrast, adding organic fertiliser with biochar increased SIN compared to biochar alone. SIN was clearly reduced after one month of biochar application, suggesting that biochar should be applied at least one month prior to planting so plants are not affected by decreased N. Our results revealed that the interactions between biochar and environmental factors, pyrolysis temperature of biochar and biochar surface properties are the main driving factors affecting SIN. There were limited long term studies of greater than 1 year, thus the long term effects of biochar on SIN still remain unclear.

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“…The key to conclusive determination of glyphosate effect on microbial communities of GR crops is to carefully compare glyphosate sprayed and non-sprayed treatments within an agronomic context. Farming systems, soil factors, crop varieties, glyphosate legacy and application rates can all impact the behavior of glyphosate and its interaction with the crop and soil microbiome [22].…”

Section: Introductionmentioning

confidence: 99%

Soil microbial communities in diverse agroecosystems exposed to glyphosate

Kepler

Schmidt

Yarwood

et al. 2018

Preprint

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24In spite of glyphosate's wide use in agriculture, questions remain about effects of the herbicide 25 on soil microbial communities. Conflicting scientific literature reports divergent results; from no 26 observable effect of glyphosate to the enrichment of common agricultural pathogens such as 27Fusarium. We conducted a comprehensive field-based study to compare treatments that did 28 and did not receive foliar application of glyphosate spray. The study included two field sites, 29Maryland and Mississippi; two crops, soybean and corn; four site years, 2013 and 2014; and a 30 variety of organic and conventional farming systems. Using amplicon sequencing, the 31 prokaryotic (16S rRNA) and fungal (ITS) communities were described along with chemical and 32 physical properties of the soil. Sections of corn and soy roots were plated to screen for the 33 presence of plant pathogens. Geography, farming system, and seasonal progression were 34 significant factors determining composition of fungal and bacterial communities. Plots treated 35 with or without glyphosate did not differ in overall microbial community composition after 36 controlling for these factors. No differential effect of glyphosate treatment was found in the 37 relative abundance of organisms such as Fusarium spp. or putative growth-promoting bacteria 38

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Impact of glyphosate on soil microbial biomass and respiration: A meta-analysis

Cited by 128 publications

References 53 publications

Glyphosate and aminomethylphosphonic acid chronic risk assessment for soil biota

Glyphosate and aminomethylphosphonic acid chronic risk assessment for soil biota

Effects of biochar on soil available inorganic nitrogen: A review and meta-analysis

Soil microbial communities in diverse agroecosystems exposed to glyphosate

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