Abstract
A 3-yr dryland study was initiated in 1999 at Munday, TX, on an Altus fine sandy loam to determine the most appropriate cotton growth stage or stages at which to apply glyphosate. The objectives were: (1) to evaluate control of silverleaf nightshade in the cotton and (2) to determine the effect on yield. Treatments were: (1) control (C; two cultivations), (2) early glyphosate at the four-leaf stage (E), (3) early glyphosate followed by a midseason application 21 d later (E+M), (4) two cultivations plus late glyphosate at 20% open bolls (L), (5) treatment E+L, and (6) treatment E+M+L. In fall 1999 and 2001, silverleaf nightshade stem numbers decreased in the plots sprayed early and midseason, and increased in plots receiving only late or no applications when compared with the counts in the spring of those years. However, in fall 2000, nightshade numbers were less than in early spring 2000 regardless of treatment, probably because of hot and dry weather. In fall 2001, silverleaf nightshade populations had increased 13-fold and twofold for the C and L treatments, respectively, when compared with populations at the beginning of the study. Other treatments had population decreases of 10 to 90%. Three-year average lint yields were higher with early or early plus midseason applications. Lint yields were similar with early or early plus midseason sprays. Lint yields were higher when nightshade/cotton biomass competition was lower. Early application of glyphosate can effectively control silverleaf nightshade populations and can increase yield when compared to no application or a late application.
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Claims 10
Claim · model-written summary
Early and midseason glyphosate sprays decreased silverleaf nightshade stem numbers in fall 1999 and 2001 relative to spring counts.
- Taxon
- Cotton
Gossypium hirsutumt0 - Treatment
- sprayed early and midseasone1
- Outcome
- silverleaf nightshade stem numberse1
- Direction
- decreasede1
- Comparator
- counts in the spring of those yearse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Glyphosate-Resistant Cotton Yield”
e1“In fall 1999 and 2001, silverleaf nightshade stem numbers decreased in the plots sprayed early and midseason, and increased in plots receiving only late or no applications when compared with the counts in the spring of those years”
Claim · model-written summary
Late or no glyphosate applications increased silverleaf nightshade stem numbers in fall 1999 and 2001 relative to spring counts.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- receiving only late or no applicationse1
- Outcome
- silverleaf nightshade stem numberse1
- Direction
- increasede1
- Comparator
- counts in the spring of those yearse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Glyphosate-Resistant Cotton Yield”
e1“In fall 1999 and 2001, silverleaf nightshade stem numbers decreased in the plots sprayed early and midseason, and increased in plots receiving only late or no applications when compared with the counts in the spring of those years”
Claim · model-written summary
In fall 2000, nightshade numbers were lower than in early spring 2000 regardless of treatment.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- nightshade numberse1
- Qualifier
- regardless of treatmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Glyphosate-Resistant Cotton Yield”
e1“In fall 2000, nightshade numbers were less than in early spring 2000 regardless of treatment, probably because of hot and dry weather”
Claim · model-written summary
Silverleaf nightshade populations increased 13-fold in fall 2001 for the control (C) treatment relative to the start of the study.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- silverleaf nightshade populationse1
- Value
- 13-folde1
- Qualifier
- for the C and L treatments, respectivelye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Glyphosate-Resistant Cotton Yield”
e1“In fall 2001, silverleaf nightshade populations had increased 13-fold and twofold for the C and L treatments, respectively, when compared with populations at the beginning of the study”
Claim · model-written summary
Silverleaf nightshade populations increased twofold in fall 2001 for the late-only (L) treatment relative to the start of the study.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- silverleaf nightshade populationse1
- Value
- twofolde1
- Qualifier
- for the C and L treatments, respectivelye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Glyphosate-Resistant Cotton Yield”
e1“In fall 2001, silverleaf nightshade populations had increased 13-fold and twofold for the C and L treatments, respectively, when compared with populations at the beginning of the study”
Claim · model-written summary
The other treatments decreased silverleaf nightshade populations by 10 to 90%.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- population decreasese1
- Value
- 10 to 90%e1
- Qualifier
- Other treatmentse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Glyphosate-Resistant Cotton Yield”
e1“Other treatments had population decreases of 10 to 90%”
Claim · model-written summary
Three-year average lint yields were higher with early or early plus midseason glyphosate applications than with no application or a late application.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- early or early plus midseason applicationse1
- Outcome
- lint yieldse1
- Direction
- highere1
- Comparator
- no application or a late applicatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Glyphosate-Resistant Cotton Yield”
e1“Three-year average lint yields were higher with early or early plus midseason applications”
e2“can increase yield when compared to no application or a late application”
Claim · model-written summary
Lint yields were similar with early or early plus midseason glyphosate sprays.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- early or early plus midseason sprayse1
- Outcome
- Lint yieldse1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Glyphosate-Resistant Cotton Yield”
e1“Lint yields were similar with early or early plus midseason sprays”
Claim · model-written summary
Lint yields were higher when silverleaf nightshade and cotton biomass competition was lower.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- Lint yieldse1
- Direction
- highere1
- Qualifier
- biomass competition was lowere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Glyphosate-Resistant Cotton Yield”
e1“Lint yields were higher when nightshade/cotton biomass competition was lower”
Claim · model-written summary
Early application of glyphosate can effectively control silverleaf nightshade populations.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- Early application of glyphosatee2
- Outcome
- silverleaf nightshade populationse2
- Direction
- decreaseinferrede2
- Comparator
- no application or a late applicatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Glyphosate-Resistant Cotton Yield”
e2“Early application of glyphosate can effectively control silverleaf nightshade populations and can increase yield when compared to no application or a late application”
The same questions in other papers
glyphosate · pest · Gossypium hirsutum (cotton)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
1 paper more in this group
See all 5 papers →application · yield · Gossypium hirsutum (cotton)Positive and negative results
29 papers in the same direction as this paper · 253 in the opposite direction
- positive
- positive
- positive
279 papers more in this group
See all 283 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.