Abstract
Different sources of plant stress, when present together, can have compounded effects on cane growth and yield. The objectives of this experiment were to determine: 1) if late-season (Nov. 1) glyphosate ripener application increases sucrose yield in the four common commercial sugarcane cultivars grown in Louisiana, USA 2) cultivar differences in susceptibility to injury from residual glyphosate in successive ratoon crops, and 3) if the stress of residual glyphosate on the subsequent ratoon crop is compounded by the presence of post-harvest residue. Glyphosate was applied on Nov. 1 (0.21 kg ai ha -1 ) to the first-ratoon crop. Two weeks after the first ratoon was harvested, the blanket of crop residue was either allowed to remain or completely removed by burning. Regardless of variety, late-season ripener application offered no increase in sucrose yield in first ratoon, and residual effects of glyphosate in the subsequent second-ratoon crop yield were not variety specific. Residual effect of glyphosate when post-harvest residue was not removed reduced sucrose yields by 13% relative to the non-treated control. Sucrose yield in the second-ratoon crop was not reduced when glyphosate was applied and residue was removed. When treated with glyphosate the previous year, residue retention reduced stalk population and photosynthesis in the second-ratoon crop compared to when residue was removed. Late-season glyphosate ripener applications are not recommended due to a lack of response by sugarcane coupled with the potential of residual injury effects caused by translocation of glyphosate into the crown, especially if post-harvest residue cannot be removed prior to the emergence of the subsequent ratoon crop.
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Claims 6
Claim · model-written summary
Late-season glyphosate ripener application did not increase sucrose yield in the first ratoon of sugarcane.
- Taxon
- sugarcanee0
- Organ / stage
- first ratoone1
- Treatment
- late-season ripener applicatione1
- Outcome
- sucrose yielde1
- Direction
- no increasee1
- Setting
- Louisiana, USAe0
Not reportedComparator
Verbatim
e0“if late-season (Nov. 1) glyphosate ripener application increases sucrose yield in the four common commercial sugarcane cultivars grown in Louisiana, USA”
e1“Regardless of variety, late-season ripener application offered no increase in sucrose yield in first ratoon”
Claim · model-written summary
Residual glyphosate with post-harvest residue left in place reduced sucrose yield by 13% relative to the non-treated control.
Verbatim
e0“if late-season (Nov. 1) glyphosate ripener application increases sucrose yield in the four common commercial sugarcane cultivars grown in Louisiana, USA”
e2“Residual effect of glyphosate when post-harvest residue was not removed reduced sucrose yields by 13% relative to the non-treated control”
Claim · model-written summary
Sucrose yield in the second-ratoon crop was not reduced when glyphosate was applied and post-harvest residue was removed.
- Taxon
- sugarcanee0
- Organ / stage
- second-ratoon crope3
- Treatment
- glyphosate was applied and residue was removede3
- Outcome
- Sucrose yielde3
- Direction
- not reducede3
- Setting
- Louisiana, USAe0
Not reportedComparator
Verbatim
e0“if late-season (Nov. 1) glyphosate ripener application increases sucrose yield in the four common commercial sugarcane cultivars grown in Louisiana, USA”
e3“Sucrose yield in the second-ratoon crop was not reduced when glyphosate was applied and residue was removed”
Claim · model-written summary
Residual effects of glyphosate on second-ratoon yield were not variety specific.
Verbatim
e0“if late-season (Nov. 1) glyphosate ripener application increases sucrose yield in the four common commercial sugarcane cultivars grown in Louisiana, USA”
e4“residual effects of glyphosate in the subsequent second-ratoon crop yield were not variety specific”
Claim · model-written summary
Residue retention after glyphosate treatment reduced stalk population and photosynthesis in the second-ratoon crop compared with residue removal.
Verbatim
e0“if late-season (Nov. 1) glyphosate ripener application increases sucrose yield in the four common commercial sugarcane cultivars grown in Louisiana, USA”
e5“When treated with glyphosate the previous year, residue retention reduced stalk population and photosynthesis in the second-ratoon crop compared to when residue was removed”
Claim · model-written summary
Late-season glyphosate ripener applications are not recommended for sugarcane because of no yield response and the risk of residual injury.
Verbatim
e6“Late-season glyphosate ripener applications are not recommended due to a lack of response by sugarcane coupled with the potential of residual injury effects caused by translocation of glyphosate into the crown”
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