Abstract
Heavy infestations of johnsongrass (Sorghum halepense (L.) Pers.) reduced the yield of six soybean (Glycine max (L.) Merr.) varieties 23 to 42% with both hand-harvesting and mechanical-harvesting over a 3-year period. ‘Davis', ‘Lee’, and ‘Bragg’ varieties produced significantly higher yields than did ‘Semmes', ‘Jackson’, or ‘Hardee’ when grown in weed-free plots, but ‘Bragg’ produced significantly higher yields than all other varieties when grown with johnsongrass. Less regrowth of johnsongrass occurred in plots of ‘Bragg’, ‘Davis', and ‘Semmes' than in plots of ‘Lee’, ‘Jackson’, and ‘Hardee’. Common cocklebur (Xanthium pensylvanicum Wallr.) reduced the average yields of six soybean varieties 63 to 75% when plots were hand-harvested. ‘Semmes' showed the lowest percentage yield reduction from common cocklebur competition when hand-harvested, and ‘Semmes' and ‘Bragg’ showed 53% to 57% reduction respectively when machine harvested.
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Claims 8
Claim · model-written summary
Heavy johnsongrass infestations reduced six soybean varieties’ yield by 23 to 42%.
- Taxon
- soybean
Glycine maxe0 - Treatment
- Heavy infestations of johnsongrasse0
- Interactor
- johnsongrass
.jpg?width=60)
Sorghum halepensee0weed - Outcome
- yield of six soybean (Glycine max (L.) Merr.) varietiese0
- Direction
- reducede0
- Value
- 23 to 42%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Heavy infestations of johnsongrass (Sorghum halepense (L.) Pers.) reduced the yield of six soybean (Glycine max (L.) Merr.) varieties 23 to 42%”
Claim · model-written summary
Davis, Lee, and Bragg yielded significantly more than Semmes, Jackson, and Hardee in weed-free plots.
- Taxon
- soybeanGlycine maxt0
- Material
- ‘Davis', ‘Lee’, and ‘Bragg’e0
- Outcome
- yieldse0
- Direction
- highere0
- Comparator
- ‘Semmes', ‘Jackson’, or ‘Hardee’e0
- Setting
- weed-free plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘Davis', ‘Lee’, and ‘Bragg’ varieties produced significantly higher yields than did ‘Semmes', ‘Jackson’, or ‘Hardee’ when grown in weed-free plots”
t0“Soybean”
Claim · model-written summary
Bragg yielded significantly more than all other varieties with johnsongrass.
- Taxon
- soybeanGlycine maxt0
- Material
- ‘Bragg’e0
- Interactor
- johnsongrassSorghum halepensee0weed
- Outcome
- yieldse0
- Direction
- highere0
- Comparator
- all other varietiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘Bragg’ produced significantly higher yields than all other varieties when grown with johnsongrass”
t0“Soybean”
Claim · model-written summary
Johnsongrass regrowth was lower with Bragg, Davis, and Semmes than with Lee, Jackson, and Hardee.
- Taxon
- soybeanGlycine maxt0
- Material
- ‘Bragg’, ‘Davis', and ‘Semmes'e0
- Interactor
- johnsongrassSorghum halepensee0weed
- Outcome
- regrowth of johnsongrasse0
- Direction
- Lesse0
- Comparator
- ‘Lee’, ‘Jackson’, and ‘Hardee’e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Less regrowth of johnsongrass occurred in plots of ‘Bragg’, ‘Davis', and ‘Semmes' than in plots of ‘Lee’, ‘Jackson’, and ‘Hardee’”
t0“Soybean”
Claim · model-written summary
Common cocklebur reduced average soybean yields 63 to 75% in hand-harvested plots.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Common cocklebure0
- Interactor
- Common cocklebure0weed
- Outcome
- average yields of six soybean varietiese0
- Direction
- reducede0
- Value
- 63 to 75%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Common cocklebur (Xanthium pensylvanicum Wallr.) reduced the average yields of six soybean varieties 63 to 75% when plots were hand-harvested”
Claim · model-written summary
Semmes had the lowest percentage yield reduction from cocklebur in hand-harvested plots.
- Taxon
- soybeanGlycine maxt0
- Material
- ‘Semmes'e0
- Interactor
- common cocklebure0weed
- Outcome
- percentage yield reductione0
- Direction
- loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘Semmes' showed the lowest percentage yield reduction from common cocklebur competition when hand-harvested”
t0“Soybean”
Claim · model-written summary
Semmes yield fell 53% under cocklebur competition with machine harvest.
- Taxon
- soybeanGlycine maxt0
- Material
- ‘Semmes'e0
- Interactor
- cocklebur
Xanthium strumariumt0weed - Outcome
- reductione0
- Direction
- reductione0
- Value
- 53%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘Semmes' and ‘Bragg’ showed 53% to 57% reduction respectively when machine harvested”
t0“Competition of Johnsongrass and Cocklebur with Six Soybean Varieties”
Claim · model-written summary
Bragg yield fell 57% under cocklebur competition with machine harvest.
- Taxon
- soybeanGlycine maxt0
- Material
- ‘Bragg’e0
- Interactor
- CockleburXanthium strumariumt0weed
- Outcome
- reductione0
- Direction
- reductione0
- Value
- 57%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘Semmes' and ‘Bragg’ showed 53% to 57% reduction respectively when machine harvested”
t0“Competition of Johnsongrass and Cocklebur with Six Soybean Varieties”
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See all 51 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.