Abstract
Production of direct seeded onion is constrained by weeds and complete loss of crop yield is not uncommon. Field trials were undertaken to study the influence of sequential applications of the herbicides pendimethalin, oxadiazon and their tank mixtures on efficacy and selectivity to direct seeded onion. Experiments were undertaken at the Gezira and Shendi Research Stations. Onion (cv Saggai) seeds were planted on ridges. Grassy weeds were predominant at the Gezira Research Farm (62 and 69%), while at Shendi Research Farm broad-leaved weeds were the most common (71%). Pendimethalin at 1.19 and 1.79 kg a. i. ha-1, applied at planting, effected excellent and persistent control (85-100%) of grassy weeds. The herbicide at the low rate displayed inconsistent performance on broad-leaved weeds across seasons and sites, while at the high rate it was toxic to the crop. Unrestricted weed growth reduced the onion bulb diameter by 55- 61% and bulb yield by 86-93%. Pendimethalin at 1.19 kg a. i. ha-1, applied at planting, followed by oxadiazon and/or their tank mixtures 2 or 4 weeks after crop emergence provided adequate weed control and significantly increased bulb size and yield. The bulb diameter and yield, obtained, were often comparable to those of the weeded control. Keywords: Direct seeded onion, weed, oxadiazon, pendimethalin, broad-leaved weeds, grasses
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Claims 12
Claim · model-written summary
Grassy weeds predominated at Gezira.
- Taxon
- onion
Allium cepat0 - Outcome
- Grassy weeds were predominante0
- Value
- 62 and 69%e0
- Setting
- Gezira Research Farme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grassy weeds were predominant at the Gezira Research Farm (62 and 69%)”
t0“onion”
Claim · model-written summary
Broad leaved weeds were most common at Shendi.
- Taxon
- onionAllium cepat0
- Outcome
- broad-leaved weeds were the most commone0
- Value
- 71%e0
- Setting
- Shendi Research Farme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at Shendi Research Farm broad-leaved weeds were the most common (71%).”
t0“onion”
Claim · model-written summary
Pendimethalin at two rates controlled grassy weeds by 85–100%.
- Taxon
- onionAllium cepat0
- Treatment
- Pendimethalin at 1.19 and 1.79 kg a. i. ha-1e0
- Interactor
- grassy weedse0weed
- Outcome
- control (85-100%) of grassy weedse0
- Direction
- excellent and persistent controle0
- Value
- 85-100%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pendimethalin at 1.19 and 1.79 kg a. i. ha-1, applied at planting, effected excellent and persistent control (85-100%) of grassy weeds.”
t0“onion”
Claim · model-written summary
Low rate pendimethalin performed inconsistently against broad leaved weeds.
- Taxon
- onionAllium cepat0
- Treatment
- The herbicide at the low ratee0
- Interactor
- broad-leaved weedse0weed
- Outcome
- performance on broad-leaved weedse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The herbicide at the low rate displayed inconsistent performance on broad-leaved weeds across seasons and sites”
t0“onion”
Claim · model-written summary
High rate pendimethalin was toxic to onion.
- Taxon
- onionAllium cepat0
- Treatment
- the high ratee0
- Outcome
- toxic to the crope0
- Direction
- toxice0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at the high rate it was toxic to the crop.”
t0“onion”
Claim · model-written summary
Unrestricted weed growth reduced onion bulb diameter by 55- 61%.
- Taxon
- onionAllium cepae0
- Treatment
- Unrestricted weed growthe0
- Interactor
- weede0weed
- Outcome
- onion bulb diametere0
- Direction
- reducede0
- Value
- 55- 61%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Unrestricted weed growth reduced the onion bulb diameter by 55- 61% and bulb yield by 86-93%.”
Claim · model-written summary
Unrestricted weed growth reduced onion bulb yield by 86-93%.
- Taxon
- onionAllium cepae0
- Treatment
- Unrestricted weed growthe0
- Interactor
- weede0weed
- Outcome
- bulb yielde0
- Direction
- reducede0
- Value
- 86-93%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Unrestricted weed growth reduced the onion bulb diameter by 55- 61% and bulb yield by 86-93%.”
Claim · model-written summary
Sequential pendimethalin followed by oxadiazon or tank mixtures provided adequate weed control.
- Taxon
- onionAllium cepat0
- Treatment
- Pendimethalin at 1.19 kg a. i. ha-1, applied at planting, followed by oxadiazon and/or their tank mixtures 2 or 4 weeks after crop emergencee0
- Interactor
- weede0weed
- Outcome
- weed controle0
- Direction
- adequate weed controle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pendimethalin at 1.19 kg a. i. ha-1, applied at planting, followed by oxadiazon and/or their tank mixtures 2 or 4 weeks after crop emergence provided adequate weed control and significantly increased bulb size and yield.”
t0“onion”
Claim · model-written summary
Sequential herbicides significantly increased bulb size.
- Taxon
- onionAllium cepat0
- Treatment
- Pendimethalin at 1.19 kg a. i. ha-1, applied at planting, followed by oxadiazon and/or their tank mixtures 2 or 4 weeks after crop emergencee0
- Outcome
- bulb sizee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pendimethalin at 1.19 kg a. i. ha-1, applied at planting, followed by oxadiazon and/or their tank mixtures 2 or 4 weeks after crop emergence provided adequate weed control and significantly increased bulb size and yield.”
t0“onion”
Claim · model-written summary
Sequential herbicides significantly increased bulb yield.
- Taxon
- onionAllium cepat0
- Treatment
- Pendimethalin at 1.19 kg a. i. ha-1, applied at planting, followed by oxadiazon and/or their tank mixtures 2 or 4 weeks after crop emergencee0
- Outcome
- yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pendimethalin at 1.19 kg a. i. ha-1, applied at planting, followed by oxadiazon and/or their tank mixtures 2 or 4 weeks after crop emergence provided adequate weed control and significantly increased bulb size and yield.”
t0“onion”
Claim · model-written summary
Sequential herbicide bulb diameter was often comparable to weeded control.
- Taxon
- onionAllium cepat0
- Treatment
- Pendimethalint0
- Outcome
- bulb diametere0
- Direction
- comparablee0
- Comparator
- weeded controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The bulb diameter and yield, obtained, were often comparable to those of the weeded control.”
t0“pendimethalin, oxadiazon and their tank mixtures to direct seeded onion”
Claim · model-written summary
Sequential herbicide bulb yield was often comparable to weeded control.
- Taxon
- onionAllium cepat0
- Treatment
- pendimethalin, oxadiazon and their tank mixturest0
- Outcome
- yielde0
- Direction
- comparablee0
- Comparator
- weeded controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The bulb diameter and yield, obtained, were often comparable to those of the weeded control.”
t0“pendimethalin, oxadiazon and their tank mixtures to direct seeded onion”
The same questions in other papers
pendimethalin · yield · Allium cepa (onion)Results differ
33 papers in the same direction as this paper · 3 in the opposite direction · 1 reporting no difference from an alternative
- no effect
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- no effect
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See all 38 papers →Oxadiazon · yield · Allium cepa (onion)Positive and negative results
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- negative
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See all 8 papers →Oxadiazon · weed · Allium cepa (onion)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
pendimethalin · weed · Allium cepa (onion)Results agree
27 papers in the same direction as this paper
- positive
- positive
- positive
24 papers more in this group
See all 28 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.