Abstract
The objective of this study was to evaluate the effects of glyphosate on soil microbial activity under appropriate and water deficit conditions. The factors consisted of four treatments with different Roundup Ready® soybean cultivars, two herbicidal treatments [glyphosate (1.080 and 1.800 g a.e. ha-1) + control] and two soil moisture treatments (appropriate and water deficit conditions), plus two soybean conventional varieties subject only to the soil moisture treatments. It was evaluated total organic carbon (TOC), basal respiration rate (CO2), microbial carbon biomass (MCB), metabolic quotient (qCO2), microbial quotient (qmic), nodule number (NN), and dry weight of nodules per plant (DWNP). Except for TOC, all other microbiological parameters were significantly influenced by the application of glyphosate, and the effects are more evident at a 1.800 g a.e. ha-1 dose in Roundup Ready® soybean cultivars associated to water deficit condition. The soil microbiota stability was favored by the absence of glyphosate application and water deficit condition on soil. MCB and qCO2 showed to be quite sensitive to changes resulting from the use of glyphosate. In general, in conventional cultivars there was lesser effect of water deficit conditions on the microbiological attributes, when compared to treatments with glyphosate application under the same conditions. Key words: Glycine max (L.) Merrill, inhibitors of the enzyme 5-enolpyruvylshikimate-3-phosphate synthase (EPSPs), microbiota, Roundup Ready® soybean seed.
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Claims 4
Claim · model-written summary
Glyphosate significantly influenced microbial parameters other than total organic carbon, especially at the higher dose with water deficit.
- Taxon
- soybean
Glycine maxe0 - Treatment
- application of glyphosatee0
- Outcome
- microbiological parameterse0
- Qualifier
- 1.800 g a.e. ha-1 dose in Roundup Ready® soybean cultivars associated to water deficit conditione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except for TOC, all other microbiological parameters were significantly influenced by the application of glyphosate, and the effects are more evident at a 1.800 g a.e. ha-1 dose in Roundup Ready® soybean cultivars associated to water deficit condition.”
Claim · model-written summary
Soil microbiota stability was favored without glyphosate and under water deficit.
- Taxon
- soybeanGlycine maxe1
- Treatment
- absence of glyphosate application and water deficit conditione0
- Outcome
- soil microbiota stabilitye0
- Direction
- favorede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The soil microbiota stability was favored by the absence of glyphosate application and water deficit condition on soil.”
e1“two soybean conventional varieties”
Claim · model-written summary
Microbial carbon biomass and metabolic quotient were sensitive to glyphosate-associated changes.
- Taxon
- soybeanGlycine maxe1
- Treatment
- glyphosatee0
- Outcome
- MCB and qCO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MCB and qCO2 showed to be quite sensitive to changes resulting from the use of glyphosate.”
e1“two soybean conventional varieties”
Claim · model-written summary
Conventional cultivars showed a lesser water deficit effect on microbial attributes than glyphosate-treated cultivars.
- Taxon
- soybeanGlycine maxe1
- Material
- conventional cultivarse0
- Treatment
- water deficit conditionse0
- Outcome
- microbiological attributese0
- Direction
- lessere0
- Comparator
- treatments with glyphosate application under the same conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In general, in conventional cultivars there was lesser effect of water deficit conditions on the microbiological attributes, when compared to treatments with glyphosate application under the same conditions.”
e1“soybean conventional varieties”
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See all 5 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.