Abstract
Commercial seed of glyphosate‐tolerant alfalfa contains small percentages of seeds, called nulls, that do not posses the herbicide trait. Differential competitiveness of glyphosate‐tolerant seedlings compared with null seedlings may be detrimental to alfalfa stand density if delayed glyphosate application allows the null and tolerant seedlings to compete with each other. Our objective was to determine if delayed glyphosate application affects plant density of glyphosate‐tolerant alfalfa stands. Commercially available glyphosate‐tolerant alfalfa was seeded at 17 and 29 kg/ha, plots were treated with glyphosate one month (3‐ to 6‐trifoliate leaf stage) or one‐year after planting and plant density was monitored throughout the study. Regardless of seedling rate an average of 6.5 and 5.5% of the alfalfa plants died when glyphosate was applied one month and one year after planting, respectively, but plant density remained unchanged during the same time periods when glyphosate was not applied. Planting alfalfa at 17 kg/ha resulted in lower seedling density, but also lower plant mortality during the seeding year than planting at 29 kg/ha. We conclude that delaying glyphosate application to glyphosate‐tolerant alfalfa until one year after planting does not alter the percent of glyphosate‐tolerant and non‐tolerant plants.
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Claims 6
Claim · model-written summary
Glyphosate one month after planting killed an average 6.5% of alfalfa plants.
- Taxon
- alfalfa
Medicago sativat0 - Treatment
- glyphosatee0
- Outcome
- alfalfa plants diede0
- Value
- 6.5e0
- Qualifier
- one monthe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regardless of seedling rate an average of 6.5 and 5.5% of the alfalfa plants died when glyphosate was applied one month and one year after planting, respectively”
t0“Alfalfa”
Claim · model-written summary
Glyphosate one year after planting killed an average 5.5% of alfalfa plants.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- glyphosatee0
- Outcome
- alfalfa plants diede0
- Value
- 5.5%e0
- Qualifier
- one yeare0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regardless of seedling rate an average of 6.5 and 5.5% of the alfalfa plants died when glyphosate was applied one month and one year after planting, respectively”
t0“Alfalfa”
Claim · model-written summary
Alfalfa plant density remained unchanged over corresponding intervals without glyphosate.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- glyphosate was not appliede0
- Outcome
- plant densitye0
- Direction
- remained unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but plant density remained unchanged during the same time periods when glyphosate was not applied.”
t0“Alfalfa”
Claim · model-written summary
A 17 kg/ha seeding rate produced lower seedling density than 29 kg/ha.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- 17 kg/hae0
- Outcome
- seedling densitye0
- Direction
- lowere0
- Comparator
- 29 kg/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Planting alfalfa at 17 kg/ha resulted in lower seedling density, but also lower plant mortality during the seeding year than planting at 29 kg/ha.”
t0“Alfalfa”
Claim · model-written summary
A 17 kg/ha seeding rate produced lower mortality in the seeding year than 29 kg/ha.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- 17 kg/hae0
- Outcome
- plant mortalitye0
- Direction
- lowere0
- Qualifier
- seeding yeare0
- Comparator
- 29 kg/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Planting alfalfa at 17 kg/ha resulted in lower seedling density, but also lower plant mortality during the seeding year than planting at 29 kg/ha.”
t0“Alfalfa”
Claim · model-written summary
Delaying glyphosate until one year after planting did not alter proportions of tolerant and non-tolerant alfalfa.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- delaying glyphosate applicatione0
- Outcome
- percent of glyphosate‐tolerant and non‐tolerant plantse0
- Direction
- does not altere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“delaying glyphosate application to glyphosate‐tolerant alfalfa until one year after planting does not alter the percent of glyphosate‐tolerant and non‐tolerant plants.”
t0“Alfalfa”
The same questions in other papers
glyphosate · organism · Medicago sativa (alfalfa)Results differ
4 papers in the same direction as this paper · 7 in the opposite direction
- positive
- positive
- positive
8 papers more in this group
See all 12 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.