Abstract
Glyphosate ( N ‐(phosphonomethyl) glycine)‐resistant (GR) soybean [ Glycine max (L.) Merr.] technology is gaining acceptance in U.S. cropping systems, yet potential yield suppression from either cultivar genetic differentials, the GR gene/gene insertion process, or glyphosate is a concern. Other work shows that the GR gene/gene insertion process may suppress soybean yield. No one has reported the effects of glyphosate on a diverse group of commercially available GR soybean cultivars. In this study we evaluated one of the potential sources of GR yield suppression—the effect of glyphosate on yield, growth, and development of GR cultivars. Field experiments were conducted at four Nebraska locations with12 GR cultivars in 1998 and 13 GR cultivars in 1999. Soybean response to glyphosate, ammonium sulfate (AMS), and water application at 21 and 42 d after soybean emergence was compared with control plots treated with AMS and water in 1998. An additional control, water alone, was added in 1999. Grain yield among cultivars differed as expected with a range of 3.44 to 3.96 Mg ha −1 in the 2‐yr averages. Glyphosate did not affect the majority of the soybean growth and development characteristics measured. Grain yield of GR soybean was not affected by glyphosate at any location or when averaged over locations. Two‐year average grain yield of cultivars treated with glyphosate, AMS, and water was 3.74 Mg ha −1 ; this was not different from 3.79 Mg ha −1 with AMS and water treatment.
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Claims 4
Claim · model-written summary
Grain yield among glyphosate-resistant soybean cultivars ranged from 3.44 to 3.96 Mg ha −1 in the two-year averages.
- Taxon
- Glycine max
Glycine maxe2 - Outcome
- Grain yield among cultivarse1
- Value
- 3.44 to 3.96 Mg ha −1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Grain yield among cultivars differed as expected with a range of 3.44 to 3.96 Mg ha −1”
e2“Glycine max (L.) Merr.”
Claim · model-written summary
Glyphosate did not affect most growth and development characteristics of soybean.
- Taxon
- Glycine maxGlycine maxe1
- Treatment
- glyphosatee2
- Outcome
- growth and development characteristicse3
- Direction
- did not affecte3
- Qualifier
- the majoritye3
- Comparator
- control plots treated with AMS and watere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Glycine max (L.) Merr.”
e2“Soybean response to glyphosate, ammonium sulfate (AMS), and water application at 21 and 42 d after soybean emergence was compared with control plots treated with AMS and water”
e3“Glyphosate did not affect the majority of the soybean growth and development characteristics measured”
Claim · model-written summary
Grain yield of glyphosate-resistant soybean was not affected by glyphosate at any location or when averaged over locations.
- Taxon
- Glycine maxGlycine maxe1
- Treatment
- glyphosatee4
- Outcome
- Grain yielde4
- Direction
- not affectede4
- Qualifier
- at any location or when averaged over locationse4
- Comparator
- control plots treated with AMS and watere2
- Setting
- four Nebraska locationse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Glycine max (L.) Merr.”
e2“Soybean response to glyphosate, ammonium sulfate (AMS), and water application at 21 and 42 d after soybean emergence was compared with control plots treated with AMS and water”
e4“Grain yield of GR soybean was not affected by glyphosate at any location or when averaged over locations”
e5“Field experiments were conducted at four Nebraska locations”
Claim · model-written summary
Two-year average grain yield with glyphosate, AMS and water (3.74 Mg ha −1) did not differ from AMS and water alone (3.79 Mg ha −1).
- Taxon
- Glycine maxGlycine maxe1
- Treatment
- glyphosate, AMS, and watere2
- Outcome
- average grain yielde2
- Direction
- not differente2
- Value
- 3.74 Mg ha −1e2
- Qualifier
- 3.79 Mg ha −1e2
- Comparator
- AMS and water treatmente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Glycine max (L.) Merr.”
e2“average grain yield of cultivars treated with glyphosate, AMS, and water was 3.74 Mg ha −1 ; this was not different from 3.79 Mg ha −1 with AMS and water treatment”
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See all 13 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.