Abstract
Abstract Previous greenhouse studies have demonstrated that photosynthesis in some cultivars of first‐ (GR1) and second‐generation (GR2) glyphosate‐resistant soybean was reduced by glyphosate. The reduction in photosynthesis that resulted from glyphosate might affect nutrient uptake and lead to lower plant biomass production and ultimately reduced grain yield. Therefore, a field study was conducted to determine if glyphosate‐induced damage to soybean ( Glycine max L. Merr. cv. Asgrow AG3539) plants observed under controlled greenhouse conditions might occur in the field environment. The present study evaluated photosynthetic rate, nutrient accumulation, nodulation, and biomass production of GR2 soybean receiving different rates of glyphosate (0, 800, 1200, 2400 g a.e. ha –1 ) applied at V2, V4, and V6 growth stages. In general, plant damage observed in the field study was similar to that in previous greenhouse studies. Increasing glyphosate rates and applications at later growth stages decreased nutrient accumulation, nodulation, leaf area, and shoot biomass production. Thus, to reduce potential undesirable effects of glyphosate on plant growth, application of the lowest glyphosate rate for weed‐control efficacy at early growth stages (V2 to V4) is suggested as an advantageous practice within current weed control in GR soybean for optimal crop productivity.
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Claims 5
Claim · model-written summary
Field plant damage resembled earlier greenhouse damage.
- Taxon
- soybean
Glycine maxt0 - Outcome
- plant damagee0
- Comparator
- previous greenhouse studiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant damage observed in the field study was similar to that in previous greenhouse studies”
t0“soybean”
Claim · model-written summary
Increasing glyphosate rates and later application reduced nutrient accumulation.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Increasing glyphosate rates and applications at later growth stagese0
- Outcome
- nutrient accumulatione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing glyphosate rates and applications at later growth stages decreased nutrient accumulation, nodulation, leaf area, and shoot biomass production.”
t0“soybean”
Claim · model-written summary
Increasing glyphosate rates and later application reduced nodulation.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Increasing glyphosate rates and applications at later growth stagese0
- Outcome
- nodulatione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing glyphosate rates and applications at later growth stages decreased nutrient accumulation, nodulation, leaf area, and shoot biomass production.”
t0“soybean”
Claim · model-written summary
Increasing glyphosate rates and later application reduced leaf area and shoot biomass production.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Increasing glyphosate rates and applications at later growth stagese0
- Outcome
- leaf area, and shoot biomass productione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing glyphosate rates and applications at later growth stages decreased nutrient accumulation, nodulation, leaf area, and shoot biomass production.”
t0“soybean”
Claim · model-written summary
The authors suggest the lowest effective glyphosate rate at early V2 to V4 stages.
- Taxon
- soybeanGlycine maxt0
- Outcome
- application of the lowest glyphosate rate for weed‐control efficacy at early growth stages (V2 to V4)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of the lowest glyphosate rate for weed‐control efficacy at early growth stages (V2 to V4) is suggested as an advantageous practice”
t0“soybean”
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