Paper · 2006 · The Indian Journal of Agricultural Sciences

Crop-weed competition in onion (Allium cepa) under mid-hill condition of North-west Himalayas*

Ved Prakash; Narendra Kumar; A. K. Srivastva

5
claims
9
verbatim quotes
2
citations
2
research areas
✓
Open access

Abstract

An experiment was conducted during winter season of 1999-000 and 2000-2001 to find out the critical period of crop-weed competition in onion (Allium cepa L.) with a set of 10 treatments comprising weedy and weed-free conditions up to 30, 60, 90, 120 days after transplanting and harvest. Weed competition index increased with increase in duration of weedy condition ranging from 2 to 77.9. On the other hand, increase in weed-free period for different duration from transplanting to 90 days after transplanting decreased weed competition index to 1.7 from 77.9Weed-free condition beyond 90 days after transplanting did not bring significant impr~vement in bulb yield. The critical period ofcrop- weed competition in onion was observed to be between 30-90 days after transplanting. Hence, the crop should be kept weed-free during this period to realize the higher bulb yield and monetary returns.'>p/>

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Claims 5

Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

Weed competition index rose with longer weedy duration from 2 to 77.9.

Taxon
onionAllium cepat0
Treatment
duration of weedy conditione0
Interactor
weede0weed
Outcome
Weed competition indexe0
Direction
increasede0
Value
2 to 77.9e0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Weed competition index increased with increase in duration of weedy condition ranging from 2 to 77.9.”

✓ located verbatim in the source · abstract, characters 288–389 · show in text ↑
t0

“onion”

✓ located verbatim in the source · title, characters 25–30 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Weed-free duration to 90 days reduced competition index from 77.9 to 1.7.

Taxon
onionAllium cepat0
Treatment
weed-free periode0
Interactor
weede0weed
Outcome
weed competition indexe0
Direction
decreasede0
Value
1.7e0
Qualifier
77.9e0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“increase in weed-free period for different duration from transplanting to 90 days after transplanting decreased weed competition index to 1.7 from 77.9”

✓ located verbatim in the source · abstract, characters 409–560 · show in text ↑
t0

“onion”

✓ located verbatim in the source · title, characters 25–30 · show in text ↑
Intervention effectobservedoriginal resultno effectnot significant (as stated)measured

Claim · model-written summary

Weed-free conditions beyond 90 days did not significantly improve bulb yield.

Taxon
onionAllium cepat0
Treatment
Weed-free condition beyond 90 days after transplantinge0
Interactor
weede0weed
Outcome
bulb yielde0
Direction
did not bring significant impr~vemente0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Weed-free condition beyond 90 days after transplanting did not bring significant impr~vement in bulb yield.”

✓ located verbatim in the source · abstract, characters 560–667 · show in text ↑
t0

“onion”

✓ located verbatim in the source · title, characters 25–30 · show in text ↑
Observationobservedoriginal resultmeasured

Claim · model-written summary

The critical weed competition period was 30 to 90 days after transplanting.

Taxon
onionAllium cepae0
Interactor
weede0weed
Outcome
critical period ofcrop- weed competitione0
Value
30-90 dayse0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“The critical period ofcrop- weed competition in onion was observed to be between 30-90 days after transplanting.”

✓ located verbatim in the source · abstract, characters 668–780 · show in text ↑
Recommendationauthor interpretationoriginal resultpositivebasis n/a

Claim · model-written summary

The authors recommend keeping onion weed-free from 30 to 90 days after transplanting.

Taxon
onionAllium cepat0
Interactor
weede0weed
Outcome
kept weed-free during this periode0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“the crop should be kept weed-free during this period to realize the higher bulb yield and monetary returns.”

✓ located verbatim in the source · abstract, characters 788–895 · show in text ↑
t0

“onion”

✓ located verbatim in the source · title, characters 25–30 · show in text ↑

herbicide · yield · Allium cepa (onion)Results differ

88 papers: 75 positive, 13 negative or no effect

12 papers in the same direction as this paper · 75 in the opposite direction

  1. positive
  2. positive
  3. positive

84 papers more in this group

See all 88 papers →

transplanting · yield · Allium cepa (onion)Positive and negative results

71 papers: 62 positive, 9 negative or no effect

8 papers in the same direction as this paper · 62 in the opposite direction

  1. positive
  2. positive
  3. positive

67 papers more in this group

See all 71 papers →

herbicide · weed · Allium cepa (onion)Positive and negative results

74 papers: 72 positive, 2 negative or no effect

71 papers in the same direction as this paper · 2 in the opposite direction

  1. negative
  2. negative
  3. positive

70 papers more in this group

See all 74 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.