Abstract
Field and laboratory studies were conducted during 1997 and 1998 in the southeast United States to determine the influence of timing of glyphosate application on seed germination (standard germination and germination index) and vigor (cold test emergence, accelerated aged emergence, and seed conductivity) of three glyphosate-resistant soybean [Glycine max (L.) Merr.] cultivars that belong to different maturity groups (MG). The soybean cultivars used were H4994 (MG IV — early maturing), H5164 (MG V — medium maturing) and H6686 (MG VI — late maturing). Weeds were controlled by glyphosate applied at 1.1 kg a.i. ha -1 at 2, 3, 4, 5, 6, or 7 wk after soybean emergence (WAE). Using glyphosate to control weeds at 5 WAE or later in the early- and medium-maturing cultivars (H4994 and H5164) results in soybean plants able to produce seeds with more vigor and germinability than when weeds are removed earlier. For late-maturing cultivar H6686, weed control at 4 WAE produces seeds with higher germination and vigor than when weeds are removed later. Key words: Glyphosate, weed control timing, soybean, seed germination and vigor, weed dry weight
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Claims 3
Claim · model-written summary
Weed removal at 5 weeks after emergence or later gave H4994 soybean seed greater vigor and germinability than earlier removal.
- Taxon
- soybean
Glycine maxe0 - Material
- H4994e0
- Organ / stage
- seedse0
- Treatment
- glyphosate to control weeds at 5 WAE or latere0
- Interactor
- weedse0weed
- Outcome
- vigor and germinabilitye0
- Direction
- moree0
- Comparator
- when weeds are removed earliere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Using glyphosate to control weeds at 5 WAE or later in the early- and medium-maturing cultivars (H4994 and H5164) results in soybean plants able to produce seeds with more vigor and germinability than when weeds are removed earlier.”
Claim · model-written summary
Weed removal at 5 weeks after emergence or later gave H5164 soybean seed greater vigor and germinability than earlier removal.
- Taxon
- soybeanGlycine maxe0
- Material
- H5164e0
- Organ / stage
- seedse0
- Treatment
- glyphosate to control weeds at 5 WAE or latere0
- Interactor
- weedse0weed
- Outcome
- vigor and germinabilitye0
- Direction
- moree0
- Comparator
- when weeds are removed earliere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Using glyphosate to control weeds at 5 WAE or later in the early- and medium-maturing cultivars (H4994 and H5164) results in soybean plants able to produce seeds with more vigor and germinability than when weeds are removed earlier.”
Claim · model-written summary
For H6686, weed control at 4 weeks after emergence yielded greater seed germination and vigor than later removal.
- Material
- H6686e0
- Organ / stage
- seedse0
- Treatment
- weed control at 4 WAEe0
- Interactor
- weedse0weed
- Outcome
- germination and vigore0
- Direction
- highere0
- Comparator
- when weeds are removed latere0
Not reportedTaxon
Verbatim
e0“For late-maturing cultivar H6686, weed control at 4 WAE produces seeds with higher germination and vigor than when weeds are removed later.”
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See all 122 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.