Abstract
Field studies were conducted in 19-cm-row soybean during 1997 and 1998 to evaluate the rate and timing of glyphosate applications applied alone at 0.42 and 0.63 kg ae/ha and with other herbicides to glyphosate-resistant soybean in terms of weed control, soybean yield, and net return. Weed species included barnyardgrass, hemp sesbania, pitted morningglory, and prickly sida. Among glyphosate-alone weed control programs, sequential applications generally provided the highest and most consistent control of all species evaluated (above 90% for broadleaf species). Glyphosate applied in combination with selective postemergence (POST) herbicides or following soil-applied herbicides controlled most species comparable to sequential glyphosate applications. Most herbicide programs, except for single glyphosate applications, were comparable to sequential glyphosate applications in terms of soybean yield and net return and ranged from 2,221 to 2,827 kg/ha and $410.28 to $549.60/ha. Depending on the year, either one or two glyphosate applications were needed for adequate weed control in programs with a soil-applied herbicide. Glyphosate rate affected neither weed control, yield, nor net return. Depending on a producer's management style and weed spectrum, weed control programs with glyphosate alone, in combination with another POST herbicide, or following soil-applied herbicides are all viable options in drilled glyphosate-resistant soybean.Nomenclature: Glyphosate; barnyardgrass, Echinochloa crus-galli (L.) Beauv. #3 ECHCG; hemp sesbania, Sesbania exaltata (Raf.) Cory. # SEBEX; pitted morningglory, Ipomoea lacunosa L. # IPOLA; prickly sida, Sida spinosa L. # SIDSP; soybean, Glycine max (L.) Merr. ‘Delta King 5961 RR’.Additional index words: Glyphosate economics, Echinochloa crus-galli, Ipomoea lacunosa, Sesbania exaltata, Sida spinosa, Glycine max, ECHCG, IPOLA, SEBEX, SIDSP.Abbreviations: NIS, nonionic surfactant; POST, postemergence.
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Claims 7
Claim · model-written summary
Sequential glyphosate gave the highest and most consistent weed control.
- Taxon
- soybean
Glycine maxt0 - Treatment
- sequential applicationse0
- Outcome
- control of all species evaluatede0
- Direction
- higheste0
- Value
- above 90%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sequential applications generally provided the highest and most consistent control of all species evaluated (above 90% for broadleaf species)”
t0“Soybean”
Claim · model-written summary
Glyphosate combinations controlled most weeds comparably to sequential applications.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Glyphosate applied in combination with selective postemergence (POST) herbicides or following soil-applied herbicidese0
- Outcome
- controlled most speciese0
- Direction
- comparablee0
- Comparator
- sequential glyphosate applicationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glyphosate applied in combination with selective postemergence (POST) herbicides or following soil-applied herbicides controlled most species comparable to sequential glyphosate applications”
t0“Soybean”
Claim · model-written summary
Most programs other than single glyphosate matched sequential programs for soybean yield.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Most herbicide programs, except for single glyphosate applicationse0
- Outcome
- soybean yielde0
- Direction
- comparablee0
- Value
- 2,221 to 2,827 kg/hae0
- Comparator
- sequential glyphosate applicationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most herbicide programs, except for single glyphosate applications, were comparable to sequential glyphosate applications in terms of soybean yield and net return and ranged from 2,221 to 2,827 kg/ha and $410.28 to $549.60/ha”
Claim · model-written summary
Most programs other than single glyphosate matched sequential programs for net return.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Most herbicide programs, except for single glyphosate applicationse0
- Outcome
- net returne0
- Direction
- comparablee0
- Value
- $410.28 to $549.60/hae0
- Comparator
- sequential glyphosate applicationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most herbicide programs, except for single glyphosate applications, were comparable to sequential glyphosate applications in terms of soybean yield and net return and ranged from 2,221 to 2,827 kg/ha and $410.28 to $549.60/ha”
Claim · model-written summary
One or two glyphosate applications were needed with soil herbicide, depending on year.
- Taxon
- soybeanGlycine maxt0
- Treatment
- one or two glyphosate applicationse0
- Outcome
- adequate weed controle0
- Value
- one or twoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Depending on the year, either one or two glyphosate applications were needed for adequate weed control in programs with a soil-applied herbicide”
t0“Soybean”
Claim · model-written summary
Glyphosate rate did not affect weed control, yield or net return.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Glyphosate ratee0
- Outcome
- weed control, yield, nor net returne0
- Direction
- neithere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glyphosate rate affected neither weed control, yield, nor net return”
t0“Soybean”
Claim · model-written summary
Several glyphosate programs were considered viable options.
- Taxon
- soybeanGlycine maxe0
- Outcome
- viable options in drilled glyphosate-resistant soybeane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“weed control programs with glyphosate alone, in combination with another POST herbicide, or following soil-applied herbicides are all viable options in drilled glyphosate-resistant soybean”
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