Abstract
The tolerance of Roundup Ready (RR) Flex cotton to topical Roundup Weathermax (glyphosate) applications and weed management programs in RR Flex cotton were studied in 2002 and 2003 at the University of Arizona Maricopa Agricultural Center. RR Flex cotton demonstrated excellent tolerance to glyphosate as measured by flower pollen shed and lint yield when sprayed topically with glyphosate at 2.25 lb ae/A four times (at the 3 leaf, 6 node, 10 node and 14 node growth stages). Line 1445 containing the current commercial RR genetic construct had a flower sterility/pollen shed rating of 4.6 (1 equals full pollen shed and 5 equals no pollen shed) on 28 June 2003 compared to ratings of 1.1 to 1.9 in lines containing the RR Flex genetic construct. Cotton yields followed a similar pattern with 1145 yielding 386 lb seed cotton/A compared to 1477 to 1894 lb seed cotton/A for the best lines containing the RR Flex genetic construct (yields were generally low because all lines had a Cocker genetic background that is not adapted to hot desert production conditions.) The presence of the RR gene did not affect the yield of genotype pairs that were identical except for the presence or absence of the RR Flex genetic construct. In the weed management study, delaying the first topical glyphosate application resulted in larger, more difficult to control weeds and reduced cotton yield by allowing greater early season competition between weeds and cotton. The best weed control programs included early (1 to 2 leaf growth stage) topical applications at rates greater than 0.75 lb ae/A and a second Roundup application after the first post-planting irrigation (10 node growth stage). The data also suggested that there may be significant value in making a layby, directed-broadcast application that includes a residual herbicide such as prometryn at layby.
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Claims 8
Claim · model-written summary
RR Flex cotton tolerated four topical glyphosate sprays as measured by pollen shed and lint yield.
- Taxon
- cotton
Gossypium hirsutume0 - Material
- RR Flexe0
- Treatment
- glyphosate at 2.25 lb ae/A four timese0
- Outcome
- flower pollen shed and lint yielde0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cotton”
e0“RR Flex cotton demonstrated excellent tolerance to glyphosate as measured by flower pollen shed and lint yield when sprayed topically with glyphosate at 2.25 lb ae/A four times (at the 3 leaf, 6 node, 10 node and 14 node growth stages).”
Claim · model-written summary
Line 1445 had more flower sterility than RR Flex lines.
- Taxon
- CottonGossypium hirsutumt0
- Material
- Line 1445e0
- Outcome
- flower sterility/pollen shed ratinge0
- Direction
- higherinferrede0
- Value
- 4.6e0
- Qualifier
- ratings of 1.1 to 1.9e0
- Comparator
- lines containing the RR Flex genetic constructe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cotton”
e0“Line 1445 containing the current commercial RR genetic construct had a flower sterility/pollen shed rating of 4.6 (1 equals full pollen shed and 5 equals no pollen shed) on 28 June 2003 compared to ratings of 1.1 to 1.9 in lines containing the RR Flex genetic construct.”
Claim · model-written summary
Line 1145 yielded less seed cotton than the best RR Flex lines.
- Taxon
- CottonGossypium hirsutumt0
- Material
- 1145e0
- Outcome
- seed cottone0
- Direction
- lowerinferrede0
- Value
- 386 lb seed cotton/Ae0
- Qualifier
- 1477 to 1894 lb seed cotton/Ae0
- Comparator
- best lines containing the RR Flex genetic constructe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cotton”
e0“Cotton yields followed a similar pattern with 1145 yielding 386 lb seed cotton/A compared to 1477 to 1894 lb seed cotton/A for the best lines containing the RR Flex genetic construct”
Claim · model-written summary
Presence of the RR gene did not affect yield in otherwise identical genotype pairs.
- Taxon
- CottonGossypium hirsutumt0
- Gene
- RR genee0
- Outcome
- yielde0
- Direction
- did not affecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cotton”
e0“The presence of the RR gene did not affect the yield of genotype pairs that were identical except for the presence or absence of the RR Flex genetic construct.”
Claim · model-written summary
Delaying the first glyphosate application led to larger weeds that were harder to control.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- delaying the first topical glyphosate applicatione0
- Interactor
- weedse0weed
- Outcome
- larger, more difficult to control weedse0
- Direction
- largere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cotton”
e0“delaying the first topical glyphosate application resulted in larger, more difficult to control weeds and reduced cotton yield by allowing greater early season competition between weeds and cotton”
Claim · model-written summary
Delaying the first glyphosate application reduced cotton yield.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- delaying the first topical glyphosate applicatione0
- Interactor
- weedse0weed
- Outcome
- cotton yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“delaying the first topical glyphosate application resulted in larger, more difficult to control weeds and reduced cotton yield by allowing greater early season competition between weeds and cotton”
Claim · model-written summary
The best weed control programs used early topical glyphosate above 0.75 lb ae/A and a second Roundup application after first irrigation.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- early (1 to 2 leaf growth stage) topical applications at rates greater than 0.75 lb ae/A and a second Roundup applicatione0
- Outcome
- best weed control programse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cotton”
e0“The best weed control programs included early (1 to 2 leaf growth stage) topical applications at rates greater than 0.75 lb ae/A and a second Roundup application after the first post-planting irrigation (10 node growth stage).”
Claim · model-written summary
A layby application with a residual herbicide such as prometryn may have significant value.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- layby, directed-broadcast application that includes a residual herbicide such as prometryne0
- Outcome
- significant valuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cotton”
e0“The data also suggested that there may be significant value in making a layby, directed-broadcast application that includes a residual herbicide such as prometryn at layby.”
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glyphosate · quality: grain · Gossypium hirsutum (cotton)Results differ
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- negative
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See all 37 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.