Abstract
A 4-yr field study was conducted during 1998 through 2001 at Stoneville, MS, to determine the effects of narrow-row transgenic cotton and soybean rotation on purple nutsedge populations and crop yield. Crop rotations over 4 yr included cotton and soybean sown in the following patterns: CCSS, CSCS, SCSC, SSCC, and continuous cotton (CCCC) and soybean (SSSS), where cotton is denoted as (C) and soybean as (S), all with herbicide programs that were glyphosate based, non–glyphosate based, or no purple-nutsedge control (NPNC). Purple nutsedge populations and shoot dry biomass were reduced in cotton and soybean rotation and continuous soybean by 72 and 92%, respectively, whereas in continuous cotton, purple nutsedge populations increased by 67% and shoot dry biomass was reduced by 32% after 4 yr. Reductions in purple nutsedge populations also occurred in soybean when cotton was rotated with soybean (CSCS and SCSC), compared with continuous cotton. Among herbicide programs, the glyphosate-based program was more effective in reducing purple nutsedge populations, compared with the non–glyphosate-based program. Seed cotton yield was greater with cotton following soybean (SCSC) than with cotton following cotton (CCCC, CCSS) in 1999. However, seed cotton yields were similar regardless of crop rotation systems in 2000 and 2001. Seed cotton yields were equivalent in the glyphosate-based and non–glyphosate-based programs in 1999 and 2001. During 1999 to 2001, seed cotton yields were reduced by 62 to 85% in NPNC compared with yields in glyphosate- and non–glyphosate-based programs. Soybean yields were unaffected by crop rotation systems in all the 4 yr. Among herbicide programs, non–glyphosate-based program in all 4 yr and glyphosate-based program in 1999 and 2000 gave higher soybean yield compared with NPNC. After 4 yr of rotation, purple nutsedge tubers and plant density were highest in continuous cotton and lowest in continuous soybean. Both herbicide programs reduced tubers per core and plant density compared with NPNC, and the glyphosate-based program was more effective than the non–glyphosate-based program. These results show that in cotton production, severe infestations of purple nutsedge can be managed by rotating cotton with soybean or by using glyphosate-based herbicide program in glyphosate-resistant cotton.Nomenclature: Glyphosate; purple nutsedge, Cyperus rotundus L. #3 CYPRO; cotton, Gossypium hirsutum L. ‘DP 436RR’; soybean, Glycine max (L.) Merr. ‘DP 5806RR’.Additional index words: Purple nutsedge tuber, transgenic crop.Abbreviations: fb, followed by; NPNC, herbicide program with no purple-nutsedge control; POST, postemergence; PPI, preplant incorporated; PRE, preemergence.
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Claims 16
Claim · model-written summary
Cotton–soybean rotation and continuous soybean reduced purple nutsedge populations by 72%.
- Taxon
- cotton and soybean
Gossypium hirsutum
Glycine maxe0 - Treatment
- cotton and soybean rotation and continuous soybeane0
- Interactor
- purple nutsedgee0weed
- Outcome
- Purple nutsedge populationse0
- Direction
- reducede0
- Value
- 72e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Purple nutsedge populations and shoot dry biomass were reduced in cotton and soybean rotation and continuous soybean by 72 and 92%, respectively”
Claim · model-written summary
Cotton–soybean rotation and continuous soybean reduced purple nutsedge shoot dry biomass by 92%.
- Taxon
- cotton and soybeanGossypium hirsutumGlycine maxe0
- Treatment
- cotton and soybean rotation and continuous soybeane0
- Interactor
- purple nutsedgee0weed
- Outcome
- shoot dry biomasse0
- Direction
- reducede0
- Value
- 92%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Purple nutsedge populations and shoot dry biomass were reduced in cotton and soybean rotation and continuous soybean by 72 and 92%, respectively”
Claim · model-written summary
In continuous cotton, nutsedge populations increased 67%.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- continuous cottone0
- Interactor
- purple nutsedgee0weed
- Outcome
- purple nutsedge populationse0
- Direction
- increasede0
- Value
- 67%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in continuous cotton, purple nutsedge populations increased by 67% and shoot dry biomass was reduced by 32% after 4 yr”
Claim · model-written summary
In continuous cotton, nutsedge shoot biomass fell 32%.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- continuous cottone0
- Interactor
- purple nutsedgee0weed
- Outcome
- shoot dry biomasse0
- Direction
- reducede0
- Value
- 32%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in continuous cotton, purple nutsedge populations increased by 67% and shoot dry biomass was reduced by 32% after 4 yr”
Claim · model-written summary
Nutsedge populations declined when soybean was rotated with cotton relative to continuous cotton.
- Taxon
- soybeanGlycine maxe0
- Treatment
- cotton was rotated with soybeane0
- Interactor
- purple nutsedgee0weed
- Outcome
- purple nutsedge populationse0
- Direction
- Reductionse0
- Comparator
- continuous cottone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reductions in purple nutsedge populations also occurred in soybean when cotton was rotated with soybean (CSCS and SCSC), compared with continuous cotton”
Claim · model-written summary
Glyphosate based programs suppressed nutsedge populations better than non glyphosate programs.
- Treatment
- glyphosate-based programe0
- Interactor
- purple nutsedgee0weed
- Outcome
- purple nutsedge populationse0
- Direction
- reducinge0
- Comparator
- non–glyphosate-based programe0
Not reportedTaxon
Verbatim
e0“the glyphosate-based program was more effective in reducing purple nutsedge populations, compared with the non–glyphosate-based program”
Claim · model-written summary
Cotton following soybean yielded more seed cotton than cotton following cotton in 1999.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- cotton following soybeane0
- Outcome
- Seed cotton yielde0
- Direction
- greatere0
- Comparator
- cotton following cottone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed cotton yield was greater with cotton following soybean (SCSC) than with cotton following cotton (CCCC, CCSS) in 1999”
Claim · model-written summary
Cotton yields were similar across rotation systems in 2000 and 2001.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- crop rotation systemse0
- Outcome
- seed cotton yieldse0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed cotton yields were similar regardless of crop rotation systems in 2000 and 2001”
Claim · model-written summary
Cotton yields were equivalent under the two herbicide programs in 1999 and 2001.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- glyphosate-basede0
- Outcome
- Seed cotton yieldse0
- Direction
- equivalente0
- Comparator
- non–glyphosate-based programse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed cotton yields were equivalent in the glyphosate-based and non–glyphosate-based programs in 1999 and 2001”
Claim · model-written summary
No-control herbicide programs reduced cotton yield by 62 to 85% versus controlled programs.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- NPNCe0
- Outcome
- seed cotton yieldse0
- Direction
- reducede0
- Value
- 62 to 85%e0
- Comparator
- glyphosate- and non–glyphosate-based programse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed cotton yields were reduced by 62 to 85% in NPNC compared with yields in glyphosate- and non–glyphosate-based programs”
Claim · model-written summary
Soybean yield was unaffected by rotation system in all four years.
- Taxon
- SoybeanGlycine maxe0
- Treatment
- crop rotation systemse0
- Outcome
- yieldse0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean yields were unaffected by crop rotation systems in all the 4 yr”
Claim · model-written summary
Non glyphosate programs yielded more soybean than NPNC in all four years.
- Taxon
- soybeanGlycine maxe0
- Treatment
- non–glyphosate-based programe0
- Outcome
- soybean yielde0
- Direction
- highere0
- Comparator
- NPNCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non–glyphosate-based program in all 4 yr and glyphosate-based program in 1999 and 2000 gave higher soybean yield compared with NPNC”
Claim · model-written summary
Glyphosate programs yielded more soybean than NPNC in 1999 and 2000.
- Taxon
- soybeanGlycine maxe0
- Treatment
- glyphosate-based programe0
- Outcome
- soybean yielde0
- Direction
- highere0
- Comparator
- NPNCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non–glyphosate-based program in all 4 yr and glyphosate-based program in 1999 and 2000 gave higher soybean yield compared with NPNC”
Claim · model-written summary
Nutsedge tubers and plant density were highest under continuous cotton and lowest under continuous soybean.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- continuous cottone0
- Interactor
- purple nutsedgee0weed
- Outcome
- purple nutsedge tubers and plant densitye0
- Direction
- higheste0
- Comparator
- continuous soybeane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“purple nutsedge tubers and plant density were highest in continuous cotton and lowest in continuous soybean”
Claim · model-written summary
Both herbicide programs reduced nutsedge tubers per core and plant density versus no control, with glyphosate more effective.
- Treatment
- Both herbicide programse0
- Outcome
- tubers per core and plant densitye0
- Direction
- reducede0
- Comparator
- NPNCe0
Not reportedTaxon
Verbatim
e0“Both herbicide programs reduced tubers per core and plant density compared with NPNC, and the glyphosate-based program was more effective than the non–glyphosate-based program”
Claim · model-written summary
The authors recommend soybean rotation or glyphosate based herbicide for severe nutsedge infestation in cotton.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- severe infestations of purple nutsedge can be managede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“severe infestations of purple nutsedge can be managed by rotating cotton with soybean or by using glyphosate-based herbicide program in glyphosate-resistant cotton”
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See all 43 papers →8 of 10 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.