Abstract
Three field experiments were conducted during 94/1995, 95/1996 and 97/1998 seasons to study the effect of some herbicide treatments on growth characteristics, yield and chemical constituents on onion (Allium cepa L.) plant. Plant height and number of leaves/plant were significanlly decreased when a single application of oxyfluorfen or methabenzthiazuron or fluazifop-butyl was applied at 21 days after sowing (OAS.). The highest significant dry weighUplant and total bulb yield were obtained when onion plants were treated either oxyfluorfen or methabenzthiazuron plus fluazifop-butyl were applied twice at 21and 63 D.A.S. Chlorophytls (a and total) concentrations showed the lowest values when a single application of fluazltop-butyl (125 or 250 g a.iJfeddan=fed.) was applied at 21 or 42 DAS. All herbicides combination treatments increased total nitrogen concentration in onion leaves, while phosphorus and potassium concentration were not affected. Single application of fluazifop-butyl at 125 or 250 9 a.i.lfed. Significantly decreased hydrolysable carbohydrates concentration in onion leaves. Oxyfluorfen alone or in combination wilh nuazifop-butyl increased the hydrolysable carbohydrates concenlration in onion leaves. All weed treatments did not alter the studied chemical constituents of the harvested onion bulbs. Thus, the best chemical weed control treatment in direct-seed onion is to apply oxyfluorfen (90 + 180 g a.i.lfed.) or methabenzthiazuron (350 + 700 9 a.i./fed.) with fluazifop-butyl (125 + 250 9 a.i./fed.) in two applications at21 and 63 D.A.S.
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Claims 9
Claim · model-written summary
Single applications of three herbicides at 21 days reduced onion height and leaf number significantly.
- Taxon
- onion (Allium cepa L.)
Allium cepat0 - Treatment
- a single application of oxyfluorfen or methabenzthiazuron or fluazifop-butyle0
- Outcome
- Plant height and number of leaves/plante0
- Direction
- decreasede0
- Qualifier
- 21 days after sowing (OAS.)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant height and number of leaves/plant were significanlly decreased when a single application of oxyfluorfen or methabenzthiazuron or fluazifop-butyl was applied at 21 days after sowing (OAS.)”
t0“EFFECTS OF SOME HERBICIDE TREATMENTS ON ONION (Allium cepa L.).”
Claim · model-written summary
Twice-applied herbicides produced the highest plant dry weight and bulb yield.
- Taxon
- onionAllium cepae0
- Treatment
- oxyfluorfen or methabenzthiazuron plus fluazifop-butyle0
- Outcome
- dry weighUplant and total bulb yielde0
- Direction
- higheste0
- Qualifier
- twice at 21and 63 D.A.S.e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest significant dry weighUplant and total bulb yield were obtained when onion plants were treated either oxyfluorfen or methabenzthiazuron plus fluazifop-butyl were applied twice at 21and 63 D.A.S.”
Claim · model-written summary
Single fluazifop-butyl treatment gave the lowest chlorophyll concentrations.
- Taxon
- onion (Allium cepa L.)Allium cepat0
- Treatment
- a single application of fluazltop-butyl (125 or 250 g a.iJfeddan=fed.)e0
- Outcome
- Chlorophytls (a and total) concentrationse0
- Direction
- lowest valuese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophytls (a and total) concentrations showed the lowest values when a single application of fluazltop-butyl (125 or 250 g a.iJfeddan=fed.) was applied at 21 or 42 DAS”
t0“EFFECTS OF SOME HERBICIDE TREATMENTS ON ONION (Allium cepa L.).”
Claim · model-written summary
Combination herbicides increased leaf nitrogen concentration.
- Taxon
- onionAllium cepae0
- Treatment
- herbicides combination treatmentse0
- Outcome
- total nitrogen concentration in onion leavese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All herbicides combination treatments increased total nitrogen concentration in onion leaves”
Claim · model-written summary
Herbicide combinations did not affect leaf phosphorus and potassium concentration.
- Taxon
- onion (Allium cepa L.)Allium cepat0
- Treatment
- herbicides combination treatmentse1
- Outcome
- phosphorus and potassium concentratione0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while phosphorus and potassium concentration were not affected”
t0“EFFECTS OF SOME HERBICIDE TREATMENTS ON ONION (Allium cepa L.).”
e1“All herbicides combination treatments increased total nitrogen concentration in onion leaves”
Claim · model-written summary
Single fluazifop-butyl application decreased leaf hydrolysable carbohydrates significantly.
- Taxon
- onionAllium cepae0
- Treatment
- Single application of fluazifop-butyl at 125 or 250 9 a.i.lfed.e0
- Outcome
- hydrolysable carbohydrates concentration in onion leavese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Single application of fluazifop-butyl at 125 or 250 9 a.i.lfed. Significantly decreased hydrolysable carbohydrates concentration in onion leaves”
Claim · model-written summary
Oxyfluorfen alone or combined with fluazifop-butyl increased leaf hydrolysable carbohydrates.
- Taxon
- onionAllium cepae0
- Treatment
- Oxyfluorfen alone or in combination wilh nuazifop-butyle0
- Outcome
- hydrolysable carbohydrates concenlration in onion leavese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oxyfluorfen alone or in combination wilh nuazifop-butyl increased the hydrolysable carbohydrates concenlration in onion leaves”
Claim · model-written summary
Weed treatments did not alter measured bulb chemical constituents.
- Taxon
- onionAllium cepae0
- Treatment
- weed treatmentse0
- Outcome
- studied chemical constituents of the harvested onion bulbse0
- Direction
- did not altere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All weed treatments did not alter the studied chemical constituents of the harvested onion bulbs”
Claim · model-written summary
The authors recommend two applications of specified herbicide combinations at 21 and 63 days.
- Taxon
- onionAllium cepae0
- Outcome
- apply oxyfluorfen (90 + 180 g a.i.lfed.) or methabenzthiazuron (350 + 700 9 a.i./fed.) with fluazifop-butyl (125 + 250 9 a.i./fed.) in two applications at21 and 63 D.A.S.e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the best chemical weed control treatment in direct-seed onion is to apply oxyfluorfen (90 + 180 g a.i.lfed.) or methabenzthiazuron (350 + 700 9 a.i./fed.) with fluazifop-butyl (125 + 250 9 a.i./fed.) in two applications at21 and 63 D.A.S.”
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herbicide · nutrient: content · Allium cepa (onion)Results agree
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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.