Abstract
Abstract Short, medium, and long-day onions ( Allium cepa L.) were field grown under normal spring conditions of increasing daylength. Three growth regulators, (2-chloroethyl)phosphonic acid (ethephon), gibberellic acid (GA 3 ), and succinic acid-2,2-dimethylhydrazide (SADH) were applied as sprays at different concentrations at the 4, 6, and 10 leaf stages of development. Ethephon reduced plant height and number of leaves and initiated earlier bulbing. Ethephon-treated plants also had a higher bulbing index (bulb/neck diameter) early in the season due to more rapid bulb enlargement but difference did not persist to maturity and at harvest ethephon significantly reduced both bulb diameter and yield. Ethephon failed to bring about earlier maturity based on plant lodging at harvest. GA 3 increased the number of leaves per plant and percentage of plants initiating multiple growing points. No measurable responses to SADH were noted.
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Claims 9
Claim · model-written summary
Ethephon reduced onion plant height and number of leaves.
- Taxon
- onions
Allium cepae0 - Treatment
- Ethephone1
- Outcome
- plant height and number of leavese1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“onions ( Allium cepa L.)”
e1“Ethephon reduced plant height and number of leaves and initiated earlier bulbing”
Claim · model-written summary
Ethephon initiated earlier bulbing in onions.
- Taxon
- onionsAllium cepae0
- Treatment
- Ethephone1
- Outcome
- bulbinge1
- Direction
- earliere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“onions ( Allium cepa L.)”
e1“Ethephon reduced plant height and number of leaves and initiated earlier bulbing”
Claim · model-written summary
Ethephon-treated onion plants had a higher bulbing index (bulb/neck diameter) early in the season.
- Taxon
- onionsAllium cepae0
- Treatment
- Ethephone1
- Outcome
- bulbing indexe1
- Direction
- highere1
- Qualifier
- early in the seasone1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“onions ( Allium cepa L.)”
e1“Ethephon-treated plants also had a higher bulbing index (bulb/neck diameter) early in the season due to more rapid bulb enlargement but difference did not persist to maturity”
Claim · model-written summary
The higher bulbing index of ethephon-treated onions did not persist to maturity.
- Taxon
- onionsAllium cepae0
- Treatment
- Ethephone1
- Outcome
- bulbing indexe1
- Direction
- did not persiste1
- Qualifier
- to maturitye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“onions ( Allium cepa L.)”
e1“Ethephon-treated plants also had a higher bulbing index (bulb/neck diameter) early in the season due to more rapid bulb enlargement but difference did not persist to maturity”
Claim · model-written summary
The early higher bulbing index in ethephon-treated onions is attributed to more rapid bulb enlargement.
- Taxon
- onionsAllium cepae0
- Treatment
- Ethephone1
- Outcome
- higher bulbing indexe1
- Qualifier
- more rapid bulb enlargemente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“onions ( Allium cepa L.)”
e1“Ethephon-treated plants also had a higher bulbing index (bulb/neck diameter) early in the season due to more rapid bulb enlargement but difference did not persist to maturity”
Claim · model-written summary
At harvest ethephon significantly reduced onion bulb diameter and yield.
- Taxon
- onionsAllium cepae0
- Treatment
- ethephone1
- Outcome
- bulb diameter and yielde1
- Direction
- reducede1
- Qualifier
- at harveste1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“onions ( Allium cepa L.)”
e1“at harvest ethephon significantly reduced both bulb diameter and yield”
Claim · model-written summary
Ethephon failed to bring about earlier maturity in onions, judged by plant lodging at harvest.
- Taxon
- onionsAllium cepae0
- Treatment
- Ethephone1
- Outcome
- earlier maturitye1
- Direction
- failed to bring aboute1
- Qualifier
- based on plant lodging at harveste1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“onions ( Allium cepa L.)”
e1“Ethephon failed to bring about earlier maturity based on plant lodging at harvest”
Claim · model-written summary
GA 3 increased the number of leaves per plant and the percentage of onion plants initiating multiple growing points.
- Taxon
- onionsAllium cepae0
- Treatment
- GA 3e1
- Outcome
- number of leaves per plant and percentage of plants initiating multiple growing pointse1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“onions ( Allium cepa L.)”
e1“GA 3 increased the number of leaves per plant and percentage of plants initiating multiple growing points”
Claim · model-written summary
No measurable responses of onions to SADH were noted.
- Taxon
- onionsAllium cepae0
- Treatment
- SADHe1
- Outcome
- measurable responsese1
- Direction
- Noe1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“onions ( Allium cepa L.)”
e1“No measurable responses to SADH were noted”
The same questions in other papers
(2-chloroethyl)phosphonic acid · yield · Allium cepa (onion)Results differ
2 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →(2-chloroethyl)phosphonic acid · phenology · Allium cepa (onion)Positive and negative results
5 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 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.