Abstract
Problem statement: Increasing seeding rates may help decrease weed pressure in soybean [Glycine max (L.) Merr.] wide row spacing. Approach: The objective of this study was to evaluate the influence of five glyphosate-resistant soybean Maturity Groups (MG) (IV, V, VI, VII and VIII) and six seeding rates (68,000,136,000, 204,000, 272,000, 340,000 and 408,000 seeds ha -1 ) on weed density under dryland conditions on the Southeastern coastal plain in 2007-2009. Results: Weed decrease with increasing seeding rate varied over years. Weed density was generally lower at higher seeding rates for most MG soybeans at 30 and 60 DAP, except MG IV and VIII at 30 DAP in 2007 and MG VI at 30 DAP in 2008. At 60 DAP, soybean Leaf Area Index (LAI) and normalized difference vegetation index (NDVI) were greater with lower weed density. Conclusion: Additionally, negative correlations were observed between weed density and plant LAI/NDVI for all MG in 2008 and MG IV through VI in 2009. These results suggest that increased seeding rates may help decrease weed pressure and improve soybean growth at early growth stages. However the response of weed pressure to seeding rate may vary over years and depend on MG soybean.
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Claims 5
Claim · model-written summary
Higher soybean seeding rates generally lowered weed density at 30 and 60 days after planting, with stated exceptions.
- Taxon
- soybeans
Glycine maxe0 - Treatment
- higher seeding ratese0
- Outcome
- Weed densitye0
- Direction
- lowere0
- Qualifier
- except MG IV and VIII at 30 DAP in 2007 and MG VI at 30 DAP in 2008e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Weed density was generally lower at higher seeding rates for most MG soybeans at 30 and 60 DAP, except MG IV and VIII at 30 DAP in 2007 and MG VI at 30 DAP in 2008.”
Claim · model-written summary
Soybean leaf area index and NDVI were greater at lower weed density at 60 DAP.
- Taxon
- soybeanGlycine maxe0
- Organ / stage
- 60 DAPe0
- Outcome
- Leaf Area Index (LAI) and normalized difference vegetation index (NDVI)e0
- Direction
- greatere0
- Comparator
- lower weed densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 60 DAP, soybean Leaf Area Index (LAI) and normalized difference vegetation index (NDVI) were greater with lower weed density.”
Claim · model-written summary
Weed density was negatively correlated with soybean LAI and NDVI for all maturity groups in 2008 and groups IV to VI in 2009.
- Taxon
- soybeanGlycine maxt0
- Material
- all MG in 2008 and MG IV through VI in 2009e0
- Interactor
- weede0weed
- Outcome
- weed density and plant LAI/NDVIe0
- Direction
- negativee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“negative correlations were observed between weed density and plant LAI/NDVI for all MG in 2008 and MG IV through VI in 2009.”
t0“Soybean”
Claim · model-written summary
The authors suggest higher seeding rates may decrease weed pressure and improve early soybean growth.
- Taxon
- soybeanGlycine maxe0
- Outcome
- increased seeding rates may help decrease weed pressure and improve soybean growthe0
- Qualifier
- at early growth stagese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results suggest that increased seeding rates may help decrease weed pressure and improve soybean growth at early growth stages.”
Claim · model-written summary
The weed pressure response to seeding rate may vary by year and soybean maturity group.
- Taxon
- soybeanGlycine maxe0
- Outcome
- response of weed pressure to seeding ratee0
- Qualifier
- may vary over years and depend on MG soybeane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However the response of weed pressure to seeding rate may vary over years and depend on MG soybean.”
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.