Abstract
SummaryThe effect of pre- or post-planting application of selected herbicides on growth and yield of transplanted onion and weeds was investigated in two field experiments conducted in Jordan during the 1997/1998 growing season. Weed competition throughout the season reduced onion yield by 94% and lowered onion quality. All herbicides [except metribuzin and diphenamid under rain-fed conditions, and linuron + terbutryn (Tempo®) under irrigation] increased onion growth and yield over the weed-infested control. Post-planting application of oxyfluorfen (at 2 l ha–1) at the three-to-four leaf stage resulted in better onion bulb yield than in the hand-weeded, weed-free control at both locations. Pre-planting treatment with oxyfluorfen at 2.5 l ha–1 gave higher yields than the weed-free control in irrigated onion, but not under rain-fed conditions. Oxadiazon (at 4 l ha–1) gave higher yields than in weed-free onion as a post-planting treatment under rain-fed conditions, and was second to oxyfluorfen for bulb production. Pre-planting application of pendimethalin (at 4 l ha–1) was also effective, and increased onion yields compared to weed-infested onion plots or other herbicides used under irrigation. Of all herbicides tested under Jordanian conditions, oxyfluorfen and oxadiazon were the best for yield and weed control in onion, followed by pendimethalin, methabenzthiazuron and linuron as pre-planting treatments, and pendimethalin, linuron and paraquat as post-planting applications.
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Claims 11
Claim · model-written summary
Season-long weed competition reduced onion yield by 94%.
- Taxon
- onion
Allium cepae0 - Treatment
- Weed competition throughout the seasone0
- Interactor
- Weede0weed
- Outcome
- onion yielde0
- Direction
- reducede0
- Value
- 94%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Weed competition throughout the season reduced onion yield by 94% and lowered onion quality.”
Claim · model-written summary
Season-long weed competition lowered onion quality.
- Taxon
- onionAllium cepae0
- Treatment
- Weed competition throughout the seasone0
- Interactor
- Weede0weed
- Outcome
- onion qualitye0
- Direction
- lowerede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Weed competition throughout the season reduced onion yield by 94% and lowered onion quality.”
Claim · model-written summary
Most tested herbicides increased onion growth and yield versus weed-infested controls, with stated exceptions.
- Taxon
- onionAllium cepae0
- Treatment
- All herbicidese0
- Outcome
- onion growth and yielde0
- Direction
- increasede0
- Qualifier
- except metribuzin and diphenamid under rain-fed conditions, and linuron + terbutryn (Tempo®) under irrigatione0
- Comparator
- weed-infested controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All herbicides [except metribuzin and diphenamid under rain-fed conditions, and linuron + terbutryn (Tempo®) under irrigation] increased onion growth and yield over the weed-infested control.”
Claim · model-written summary
Post-planting oxyfluorfen yielded more onion bulbs than hand weeding at both locations.
- Taxon
- onionAllium cepae0
- Organ / stage
- three-to-four leaf stagee0
- Treatment
- Post-planting application of oxyfluorfen (at 2 l ha–1)e0
- Outcome
- onion bulb yielde0
- Direction
- bettere0
- Qualifier
- both locationse0
- Comparator
- hand-weeded, weed-free controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Post-planting application of oxyfluorfen (at 2 l ha–1) at the three-to-four leaf stage resulted in better onion bulb yield than in the hand-weeded, weed-free control at both locations.”
Claim · model-written summary
Pre-planting oxyfluorfen increased irrigated onion yield over weed-free controls, but not under rain-fed conditions.
- Taxon
- onionAllium cepae0
- Treatment
- Pre-planting treatment with oxyfluorfen at 2.5 l ha–1e0
- Outcome
- yieldse0
- Direction
- highere0
- Qualifier
- in irrigated onion, but not under rain-fed conditionse0
- Comparator
- weed-free controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pre-planting treatment with oxyfluorfen at 2.5 l ha–1 gave higher yields than the weed-free control in irrigated onion, but not under rain-fed conditions.”
Claim · model-written summary
Post-planting oxadiazon increased rain-fed onion yield over weed-free controls.
- Taxon
- onionAllium cepae0
- Treatment
- Oxadiazon (at 4 l ha–1)e0
- Outcome
- yieldse0
- Direction
- highere0
- Qualifier
- under rain-fed conditionse0
- Comparator
- weed-free onione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oxadiazon (at 4 l ha–1) gave higher yields than in weed-free onion as a post-planting treatment under rain-fed conditions, and was second to oxyfluorfen for bulb production.”
Claim · model-written summary
Oxadiazon ranked second to oxyfluorfen for bulb production.
- Taxon
- onionAllium cepae0
- Treatment
- Oxadiazon (at 4 l ha–1)e0
- Outcome
- bulb productione0
- Direction
- second toe0
- Comparator
- oxyfluorfene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oxadiazon (at 4 l ha–1) gave higher yields than in weed-free onion as a post-planting treatment under rain-fed conditions, and was second to oxyfluorfen for bulb production.”
Claim · model-written summary
Pre-planting pendimethalin increased irrigated onion yield over weed-infested plots or other herbicides.
- Taxon
- onionAllium cepae0
- Treatment
- Pre-planting application of pendimethalin (at 4 l ha–1)e0
- Outcome
- onion yieldse0
- Direction
- increasede0
- Qualifier
- under irrigatione0
- Comparator
- weed-infested onion plots or other herbicidese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pre-planting application of pendimethalin (at 4 l ha–1) was also effective, and increased onion yields compared to weed-infested onion plots or other herbicides used under irrigation.”
Claim · model-written summary
Oxyfluorfen and oxadiazon were judged best for onion yield and weed control in Jordan.
- Taxon
- onionAllium cepae0
- Outcome
- oxyfluorfen and oxadiazon were the best for yield and weed control in onione0
- Setting
- Jordaniane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Of all herbicides tested under Jordanian conditions, oxyfluorfen and oxadiazon were the best for yield and weed control in onion, followed by pendimethalin, methabenzthiazuron and linuron as pre-planting treatments, and pendimethalin, linuron and paraquat as post-planting applications.”
Claim · model-written summary
The next-ranked pre-planting herbicides were pendimethalin, methabenzthiazuron and linuron.
- Taxon
- onionAllium cepae0
- Outcome
- pendimethalin, methabenzthiazuron and linuron as pre-planting treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Of all herbicides tested under Jordanian conditions, oxyfluorfen and oxadiazon were the best for yield and weed control in onion, followed by pendimethalin, methabenzthiazuron and linuron as pre-planting treatments, and pendimethalin, linuron and paraquat as post-planting applications.”
Claim · model-written summary
The next-ranked post-planting herbicides were pendimethalin, linuron and paraquat.
- Taxon
- onionAllium cepae0
- Outcome
- pendimethalin, linuron and paraquat as post-planting applicationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Of all herbicides tested under Jordanian conditions, oxyfluorfen and oxadiazon were the best for yield and weed control in onion, followed by pendimethalin, methabenzthiazuron and linuron as pre-planting treatments, and pendimethalin, linuron and paraquat as post-planting applications.”
The same questions in other papers
pendimethalin · yield · Allium cepa (onion)Results differ
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- no effect
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7 papers in the same direction as this paper · 3 in the opposite direction
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See all 11 papers →competition · yield · Allium cepa (onion)Positive and negative results
10 papers in the same direction as this paper · 1 in the opposite direction
- negative
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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.