Abstract
Abstract The indeterminate growth habit of cotton ( Gossypium hirsutum L.) forces producers to harvest more than once or to postpone harvest for several weeks. Ethephon (2‐chloroethyl phosphonic acid) causes immature bolls to open, resulting in a greater percent of the crop harvested at first harvest or in once‐over harvest. The objectives of this study were to determine the effects of ethephon on seedcotton yields and fiber quality relative to the physiological stage of maturity at treatment with ethephon. ‘Stoneville 213’ and ‘CAMD‐E’ were planted on three dates in 1980 and Stoneville 213 on four dates in 1981 in Calloway silt loam, a Glossaquic Fragiudalf. Ethephon was applied at 1.12 kg ai. ha −1 and compared with no ethephon treatment in 1980 when plants ranged from 19 to 62% opened bolls. Stoneville 213 ranged from 12 to 72% opened when treated in 1981. The statistical design was a split‐block, split‐plot of a randomized complete block with four replications. Ethephon significantly reduced seed cotton yield when applied to cotton with 48 to 62% opened bolls in 1980 but not when applied to cotton averaging 22% opened. In 1981, no consistent effects of ethephon on seed cotton yields were detected. Over years, ethephon applied to cotton with 12 to 25% opened bolls did not reduce seed cotton yields relative to application to cotton with 48 to 72% opened bolls. No consistent detrimental effects on fiber quality were detected for fiber from first harvest or from once over harvest.
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Claims 5
Claim · model-written summary
Ethephon significantly reduced cotton yield at 48 to 62% opened bolls in 1980.
- Taxon
- cotton
Gossypium hirsutume0 - Treatment
- Ethephone0
- Outcome
- seed cotton yielde0
- Direction
- reducede0
- Qualifier
- 48 to 62% opened bolls in 1980e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethephon significantly reduced seed cotton yield when applied to cotton with 48 to 62% opened bolls in 1980”
Claim · model-written summary
Ethephon did not significantly reduce yield at an average of 22% opened bolls in 1980.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- Ethephone0
- Outcome
- seed cotton yielde0
- Direction
- note0
- Qualifier
- 22% openede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethephon significantly reduced seed cotton yield when applied to cotton with 48 to 62% opened bolls in 1980 but not when applied to cotton averaging 22% opened”
Claim · model-written summary
No consistent effect of ethephon on cotton yield was detected in 1981.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- ethephone0
- Outcome
- seed cotton yieldse0
- Direction
- no consistent effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1981, no consistent effects of ethephon on seed cotton yields were detected”
Claim · model-written summary
Across years, applying ethephon at 12 to 25% opened bolls did not reduce yield relative to applying it at 48 to 72%.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- ethephon applied to cotton with 12 to 25% opened bollse0
- Outcome
- seed cotton yieldse0
- Direction
- did not reducee0
- Comparator
- application to cotton with 48 to 72% opened bollse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ethephon applied to cotton with 12 to 25% opened bolls did not reduce seed cotton yields relative to application to cotton with 48 to 72% opened bolls”
Claim · model-written summary
No consistent detrimental ethephon effect on fiber quality was detected in first or once over harvest.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- fiber qualitye0
- Direction
- No consistent detrimental effectse0
- Qualifier
- first harvest or from once over harveste0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No consistent detrimental effects on fiber quality were detected for fiber from first harvest or from once over harvest”
t0“cotton”
The same questions in other papers
(2-chloroethyl)phosphonic acid · yield · Gossypium hirsutum (cotton)Results differ
6 papers in the same direction as this paper · 13 in the opposite direction
- positive
- positive
- positive
16 papers more in this group
See all 20 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.