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Late-season glyphosate ripener application coupler with post-harvest residue retention impacts subsequent ratoon yields
- 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.
Viator, Ryan P. , Dailey, Caleb D. , Richard, Edward P. Jr.
glyphosate , plant growth substances , sugarcane , Saccharum officinarum , pesticide application , application timing , crop residues , sucrose , yields , plant damage , herbicide resistance , herbicide residues , shoots , cultivars , plant stress , residual effects , Louisiana
- Includes references
- International sugar journal 2011 May, v. 113, no. 1345
Journal Articles, USDA Authors, Peer-Reviewed
- Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.