Abstract
Redroot pigweed ( Amaranthus retroflexus L.) and robust foxtail [ Setaria viridis (L.) Beauv. var. robusta-alba Schreiber (RWF) or Setaria viridis var. robusta-purpurea Schreiber (RPF)] were investigated regarding their ability to interfere with soybean [ Glycine max (L.) Merr. ‘Amsoy 71′] at different weed densities and soybean row spacing throughout two growing seasons. Final weed densities for each species tended to reach a common value because of intraspecific interference regardless of the initial density. With cultivation, a narrow soybean row spacing (38 cm) resulted in less weed growth than did a wide row spacing (76 cm) but with no cultivation, the trend was reversed. Soybeans provided less interference to foxtail than to pigweed during both growing seasons. Interference from foxtail adversely affected soybean yield components and soybean seed yield more than did pigweed interference. Water-stress conditions in 1976 increased the intensity of weed interference and reduced soybean seed yield more severely than in 1975 when moisture was adequate throughout the growing season.
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Claims 6
Claim · model-written summary
Final weed densities converged because of within-species interference.
- Taxon
- Soybeans
Glycine maxt0 - Outcome
- Final weed densitiese0
- Direction
- reach a common valuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Final weed densities for each species tended to reach a common value because of intraspecific interference regardless of the initial density”
t0“Redroot Pigweed (Amaranthus retroflexus) and Robust Foxtail (Setaria viridisvar.robusta-albaor var.robusta-purpurea) in Soybeans”
Claim · model-written summary
With cultivation, narrow soybean rows reduced weed growth relative to wide rows.
- Taxon
- soybeanGlycine maxe0
- Treatment
- narrow soybean row spacing (38 cm)e0
- Outcome
- weed growthe0
- Direction
- lesse0
- Qualifier
- With cultivatione0
- Comparator
- wide row spacing (76 cm)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With cultivation, a narrow soybean row spacing (38 cm) resulted in less weed growth than did a wide row spacing (76 cm)”
Claim · model-written summary
Without cultivation, the row-spacing effect on weed growth reversed.
- Taxon
- SoybeansGlycine maxt0
- Treatment
- no cultivatione0
- Outcome
- trende0
- Direction
- reversede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but with no cultivation, the trend was reversed”
t0“Soybeans”
Claim · model-written summary
Soybeans interfered less with foxtail than with pigweed.
- Taxon
- SoybeansGlycine maxe0
- Interactor
- foxtail
.jpg?width=60)
Alopecurus pratensise0weed - Outcome
- interference to foxtaile0
- Direction
- lesse0
- Comparator
- pigweede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Soybeans provided less interference to foxtail than to pigweed during both growing seasons”
Claim · model-written summary
Foxtail reduced soybean yield components and seed yield more than pigweed.
- Taxon
- soybeanGlycine maxe0
- Interactor
- foxtailAlopecurus pratensise0weed
- Outcome
- soybean yield components and soybean seed yielde0
- Direction
- moree0
- Comparator
- pigweed interferencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Interference from foxtail adversely affected soybean yield components and soybean seed yield more than did pigweed interference”
Claim · model-written summary
Water stress intensified weed interference and reduced soybean seed yield more in 1976 than in 1975.
- Taxon
- soybeanGlycine maxe0
- Interactor
- weede0weed
- Outcome
- soybean seed yielde0
- Direction
- reducede0
- Qualifier
- Water-stress conditions in 1976e0
- Comparator
- 1975 when moisture was adequatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water-stress conditions in 1976 increased the intensity of weed interference and reduced soybean seed yield more severely than in 1975 when moisture was adequate throughout the growing season”
The same questions in other papers
density · weed · Glycine max (soybean)Positive and negative results
20 papers in the same direction as this paper · 9 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
- no effect
27 papers more in this group
See all 31 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.