Abstract
Field research was conducted in 1999 and 2000 to determine the effect of reduced glyphosate rates on growth and yield of nonglyphosate-resistant cotton. Rates of 9, 18, 35, 70, 140, and 280 g ha −1 , representing 0.008, 0.016, 0.031 0.063, 0.125, and 0.25, respectively, of the maximum use rate per application (1,120 g ha −1 ), were applied to cotton at the two-, five-, or nine-node growth stage. On the basis of visual injury estimates, cotton was more tolerant to glyphosate at the nine-node than at earlier growth stages. Plant dry weight was reduced with 70 g ha −1 of glyphosate or higher, when applied at the two- and five-node growth stages in two of three experiments. Dry weight was not affected by glyphosate at the nine-node stage. Plant height also was unaffected by glyphosate rates below 70 g ha −1 , but height reduction was noted for all growth stages by experiment combinations, with the exception of the nine-node application for both experiments in 2000, with herbicide rates of 70 g ha −1 or higher. Cotton maturity delay, as noted by an increase in node above white flower number, was observed only at the highest glyphosate rate applied to two- and five-node cotton in one of three experiments. Percent open boll data analysis indicated a decreased opportunity of observing an open boll with increasing glyphosate rate, and this effect was greater at the five-node compared with the two- and nine-node stages in two of three experiments. Seedcotton yield after all glyphosate applications was equivalent to that for the nontreated control.
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Claims 9
Claim · model-written summary
Cotton was more tolerant of glyphosate at nine nodes than earlier stages.
- Taxon
- cotton
Gossypium hirsutume0 - Organ / stage
- nine-nodee0
- Treatment
- glyphosatee0
- Outcome
- tolerant to glyphosatee0
- Direction
- more tolerante0
- Comparator
- earlier growth stagese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cotton was more tolerant to glyphosate at the nine-node than at earlier growth stages.”
Claim · model-written summary
Glyphosate at 70 g ha −1 or higher reduced cotton dry weight at two and five nodes in two of three experiments.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- two- and five-node growth stagese0
- Treatment
- 70 g ha −1 of glyphosate or highere0
- Outcome
- Plant dry weighte0
- Direction
- reducede0
- Qualifier
- two of three experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“nonglyphosate-resistant cotton”
e0“Plant dry weight was reduced with 70 g ha −1 of glyphosate or higher, when applied at the two- and five-node growth stages in two of three experiments.”
Claim · model-written summary
Glyphosate did not affect cotton dry weight at nine nodes.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- nine-node stagee0
- Treatment
- glyphosatee0
- Outcome
- Dry weighte0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“nonglyphosate-resistant cotton”
e0“Dry weight was not affected by glyphosate at the nine-node stage.”
Claim · model-written summary
Glyphosate rates below 70 g ha −1 did not affect cotton height.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- glyphosate rates below 70 g ha −1e0
- Outcome
- Plant heighte0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“nonglyphosate-resistant cotton”
e0“Plant height also was unaffected by glyphosate rates below 70 g ha −1”
Claim · model-written summary
Glyphosate rates of 70 g ha −1 or higher reduced cotton height except at nine nodes in 2000.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- herbicide rates of 70 g ha −1 or highere0
- Outcome
- heighte0
- Direction
- reductione0
- Qualifier
- with the exception of the nine-node application for both experiments in 2000e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“nonglyphosate-resistant cotton”
e0“height reduction was noted for all growth stages by experiment combinations, with the exception of the nine-node application for both experiments in 2000, with herbicide rates of 70 g ha −1 or higher.”
Claim · model-written summary
The highest glyphosate rate delayed cotton maturity at two and five nodes in one experiment.
- Taxon
- CottonGossypium hirsutume0
- Organ / stage
- two- and five-node cottone0
- Treatment
- highest glyphosate ratee0
- Outcome
- Cotton maturity delaye0
- Direction
- delaye0
- Qualifier
- one of three experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“nonglyphosate-resistant cotton”
e0“Cotton maturity delay, as noted by an increase in node above white flower number, was observed only at the highest glyphosate rate applied to two- and five-node cotton in one of three experiments.”
Claim · model-written summary
Increasing glyphosate rate reduced the chance of observing an open cotton boll.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- increasing glyphosate ratee0
- Outcome
- opportunity of observing an open bolle0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“nonglyphosate-resistant cotton”
e0“Percent open boll data analysis indicated a decreased opportunity of observing an open boll with increasing glyphosate rate”
Claim · model-written summary
The open boll response was greater at five nodes than two or nine nodes in two experiments.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- five-nodee0
- Outcome
- effecte0
- Direction
- greatere0
- Qualifier
- two of three experimentse0
- Comparator
- two- and nine-node stagese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“nonglyphosate-resistant cotton”
e0“this effect was greater at the five-node compared with the two- and nine-node stages in two of three experiments.”
Claim · model-written summary
Seedcotton yield was equivalent to the untreated control after all glyphosate applications.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- all glyphosate applicationse0
- Outcome
- Seedcotton yielde0
- Direction
- equivalente0
- Comparator
- nontreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“nonglyphosate-resistant cotton”
e0“Seedcotton yield after all glyphosate applications was equivalent to that for the nontreated control.”
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See all 35 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.