Abstract
There are conflicting claims as to whether treatment with glyphosate adversely affects mineral nutrition of glyphosate-resistant (GR) crops. Those who have made claims of adverse effects have argued links between reduced Mn and diseases in these crops. This article describes experiments designed to determine the effects of a recommended rate (0.86 kg ha(-1)) of glyphosate applied once or twice on the mineral content of young and mature leaves, as well as in seeds produced by GR soybeans (Glycine max) in both the greenhouse and field using inductively coupled plasma mass spectrometry (ICP-MS). In the greenhouse, there were no effects of either one application (at 3 weeks after planting, WAP) or two applications (at 3 and 6 WAP) of glyphosate on Ca, Mg, Mn, Zn, Fe, Cu, Sr, Ba, Al, Cd, Cr, Co, or Ni content of young or old leaves sampled at 6, 9, and 12 WAP and in harvested seed. Se concentrations were too low for accurate detection in leaves, but there was also no effect of glyphosate applications on Se in the seeds. In the field study, there were no effects of two applications (at 3 and 6 WAP) of glyphosate on Ca, Mg, Mn, Zn, Fe, Cu, Sr, Ba, Al, Cd, Cr, Co, or Ni content of young or old leaves at either 9 or 12 WAP. There was also no effect on Se in the seeds. There was no difference in yield between control and glyphosate-treated GR soybeans in the field. The results indicate that glyphosate does not influence mineral nutrition of GR soybean at recommended rates for weed management in the field. Furthermore, the field studies confirm the results of greenhouse studies.
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Claims 7
Claim · model-written summary
One glyphosate application did not affect listed mineral contents of young or old GR soybean leaves or harvested seed in the greenhouse.
- Taxon
- soybeans
Glycine maxe1 - Material
- GR soybeanse1
- Organ / stage
- young or old leavese0
- Treatment
- one application (at 3 weeks after planting, WAP)e0
- Outcome
- Ca, Mg, Mn, Zn, Fe, Cu, Sr, Ba, Al, Cd, Cr, Co, or Ni contente0
- Direction
- no effectse0
- Setting
- greenhousee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the greenhouse, there were no effects of either one application (at 3 weeks after planting, WAP) or two applications (at 3 and 6 WAP) of glyphosate on Ca, Mg, Mn, Zn, Fe, Cu, Sr, Ba, Al, Cd, Cr, Co, or Ni content of young or old leaves sampled at 6, 9, and 12 WAP and in harvested seed.”
e1“GR soybeans (Glycine max)”
Claim · model-written summary
Two glyphosate applications did not affect listed mineral contents of young or old GR soybean leaves or harvested seed in the greenhouse.
- Taxon
- soybeansGlycine maxe1
- Material
- GR soybeanse1
- Organ / stage
- harvested seede0
- Treatment
- two applications (at 3 and 6 WAP) of glyphosatee0
- Outcome
- Ca, Mg, Mn, Zn, Fe, Cu, Sr, Ba, Al, Cd, Cr, Co, or Ni contente0
- Direction
- no effectse0
- Setting
- greenhousee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the greenhouse, there were no effects of either one application (at 3 weeks after planting, WAP) or two applications (at 3 and 6 WAP) of glyphosate on Ca, Mg, Mn, Zn, Fe, Cu, Sr, Ba, Al, Cd, Cr, Co, or Ni content of young or old leaves sampled at 6, 9, and 12 WAP and in harvested seed.”
e1“GR soybeans (Glycine max)”
Claim · model-written summary
Soybean leaf selenium concentrations were too low for accurate detection.
- Taxon
- soybeansGlycine maxe1
- Organ / stage
- leavese0
- Outcome
- Se concentrationse0
- Qualifier
- too low for accurate detectione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Se concentrations were too low for accurate detection in leaves”
e1“GR soybeans (Glycine max)”
Claim · model-written summary
Glyphosate applications did not affect selenium in GR soybean seeds in the greenhouse.
- Taxon
- soybeansGlycine maxe2
- Treatment
- glyphosate applicationse0
- Outcome
- Se in the seedse0
- Direction
- no effecte0
- Setting
- greenhousee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was also no effect of glyphosate applications on Se in the seeds.”
e1“In the greenhouse, there were no effects”
e2“GR soybeans (Glycine max)”
Claim · model-written summary
Two glyphosate applications did not affect listed mineral contents of young or old GR soybean leaves in the field.
- Taxon
- soybeansGlycine maxe1
- Material
- GR soybeanse1
- Organ / stage
- young or old leavese0
- Treatment
- two applications (at 3 and 6 WAP) of glyphosatee0
- Outcome
- Ca, Mg, Mn, Zn, Fe, Cu, Sr, Ba, Al, Cd, Cr, Co, or Ni contente0
- Direction
- no effectse0
- Setting
- field studye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the field study, there were no effects of two applications (at 3 and 6 WAP) of glyphosate on Ca, Mg, Mn, Zn, Fe, Cu, Sr, Ba, Al, Cd, Cr, Co, or Ni content of young or old leaves at either 9 or 12 WAP.”
e1“GR soybeans (Glycine max)”
Claim · model-written summary
Field glyphosate applications did not affect selenium in GR soybean seeds.
- Taxon
- soybeansGlycine maxe2
- Treatment
- two applications (at 3 and 6 WAP) of glyphosatee1
- Outcome
- Se in the seedse0
- Direction
- no effecte0
- Setting
- field studye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was also no effect on Se in the seeds.”
e1“In the field study, there were no effects of two applications (at 3 and 6 WAP) of glyphosate”
e2“GR soybeans (Glycine max)”
Claim · model-written summary
Field GR soybean yield did not differ between control and glyphosate treatments.
- Taxon
- soybeansGlycine maxe0
- Material
- GR soybeanse0
- Treatment
- glyphosate-treatede0
- Outcome
- yielde0
- Direction
- no differencee0
- Comparator
- controle0
- Setting
- fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no difference in yield between control and glyphosate-treated GR soybeans in the field.”
The same questions in other papers
glyphosate · nutrient: content · Glycine max (soybean)Positive and negative results
13 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- negative
12 papers more in this group
See all 16 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.