Abstract
Interference within a mixture of equal densities of common lambsquarters ( Chenopodium album L.), kochia [ Kochia scoparia (L.) Schrad.], and redroot pigweed ( Amaranthus retroflexus L.) in sugarbeets ( Beta vulgaris L. ‘Mono Hy D2’) was determined in a 3-yr field study. Yield of sugarbeet roots and sucrose per hectare decreased as intensity of competition from equal populations of these three weeds increased. At densities of 6, 12, 18, and 24 broadleaf weeds per 30 m of row, root yields were reduced 13, 24, 33, and 39%, respectively. Sucrose yields were reduced similarly. Fewer than three weeds per 30 m of row did not significantly reduce root yield. Reduction in root yield (Y) of sugarbeets caused by specific densities (X) of the three broadleaf weeds was predicted by using the linear equation Y = 1.64 + 1.88 X. The actual reductions in yield were always less than the predicted reductions when this equation was tested against 36 weed control systems because the competitive ability of broadleaf weeds that were treated with herbicides, but not killed, was suppressed during the growing season. By harvest, broadleaf weeds present in weed-control-system plots weighed an average of 75 to 85% less than broadleaf weeds present in nontreated plots.
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Claims 6
Claim · model-written summary
Root yield fell by 13, 24, 33 and 39% at four increasing weed densities.
- Taxon
- sugarbeets
Beta vulgaris subsp. vulgarist0 - Interactor
- broadleaf weedse0weed
- Outcome
- root yieldse0
- Direction
- reducede0
- Value
- 13, 24, 33, and 39%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At densities of 6, 12, 18, and 24 broadleaf weeds per 30 m of row, root yields were reduced 13, 24, 33, and 39%, respectively.”
t0“sugarbeets (Beta vulgaris)”
Claim · model-written summary
Sucrose yield declined similarly as weed density increased.
- Taxon
- sugarbeetsBeta vulgaris subsp. vulgarist0
- Interactor
- weedse1weed
- Outcome
- Sucrose yieldse0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sucrose yields were reduced similarly.”
e1“these three weeds increased”
t0“sugarbeets (Beta vulgaris)”
Claim · model-written summary
Fewer than three weeds per 30 m of row did not significantly reduce root yield.
- Taxon
- sugarbeetsBeta vulgaris subsp. vulgarist0
- Interactor
- weedse0weed
- Outcome
- root yielde0
- Direction
- did not significantly reducee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fewer than three weeds per 30 m of row did not significantly reduce root yield.”
t0“sugarbeets (Beta vulgaris)”
Claim · model-written summary
A linear equation predicted root-yield reduction from broadleaf weed density.
- Taxon
- sugarbeetsBeta vulgaris subsp. vulgarise0
- Interactor
- broadleaf weedse0weed
- Outcome
- Reduction in root yielde0
- Value
- Y = 1.64 + 1.88 Xe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction in root yield (Y) of sugarbeets caused by specific densities (X) of the three broadleaf weeds was predicted by using the linear equation Y = 1.64 + 1.88 X.”
Claim · model-written summary
Observed yield reductions were below predictions in 36 weed control systems.
Verbatim
e0“The actual reductions in yield were always less than the predicted reductions when this equation was tested against 36 weed control systems”
Claim · model-written summary
At harvest, weeds in control-system plots weighed 75 to 85% less than those in untreated plots.
- Taxon
- sugarbeetsBeta vulgaris subsp. vulgarist0
- Treatment
- weed-control-system plotse0
- Interactor
- broadleaf weedse0weed
- Outcome
- broadleaf weeds present in weed-control-system plots weighede0
- Direction
- lesse0
- Value
- 75 to 85%e0
- Comparator
- nontreated plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By harvest, broadleaf weeds present in weed-control-system plots weighed an average of 75 to 85% less than broadleaf weeds present in nontreated plots.”
t0“sugarbeets (Beta vulgaris)”
The same questions in other papers
herbicide · weed · Beta vulgaris (beet)Positive and negative results
49 papers in the same direction as this paper · 12 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
- negative
59 papers more in this group
See all 63 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.