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Evaluation of Trinexapac-Ethyl for Use as a Ripener in Florida Sugarcane

Evaluation of Trinexapac-Ethyl for Use as a Ripener in Florida Sugarcane. C. Rainbolt, G. Powell, G. Montes, R. Rice, and J. Shine. Sugarcane Ripening in FL. High temperature, soil moisture, and available nitrogen limit early season natural ripening

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Evaluation of Trinexapac-Ethyl for Use as a Ripener in Florida Sugarcane

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  1. Evaluation of Trinexapac-Ethyl for Use as a Ripener in Florida Sugarcane C. Rainbolt, G. Powell, G. Montes, R. Rice, and J. Shine

  2. Sugarcane Ripening in FL • High temperature, soil moisture, and available nitrogen limit early season natural ripening • Application of glyphosate results in higher sucrose content earlier in the growing season • Glyphosate is widely used in final ratoon • Use in earlier ratoons results in growth and stand reductions

  3. Trinexapac-ethyl • Trinexapac is a foliar absorbed plant growth regulator • Interferes with gibberelic acid metabolic pathway • Affects cell elongation, chilling tolerance, and photoperiod response • Registered for use in grass seed production (Palisade) and turf (Primo, PrimoMAXX) in the USA

  4. Trinexapac-ethyl • Registered in Latin America (Brazil) as Moddus for use in sugarcane as a ripener and harvest management tool • Data from Brazil indicates a potential 10% increase in sucrose • Increased tillering in the following ratoon • Applied at 200-300 g ai/ha 45-70 days before harvest

  5. Objectives • Evaluate efficacy of trinexapac as a ripener • Evaluate potential for an extended harvest interval • Determine if trinexapac can be used in every year’s crop without stand reductions in subsequent ratoons

  6. Plot Establishment • In summer 2004, plots were established at Okeelanta in field of CP89-2143 plant cane and the Everglades REC in CP72-2086 plant cane • Plot sizes were 6 x 15 m at Okeelanta and 6 x 12 m at EREC

  7. Treatment Application • Treatments were applied using a CO2 pressurized tractor pulled sprayer calibrated to deliver 47 l/ha • Application dates: October 5 at Okeelanta and October 19 at EREC

  8. Sampling • 10 stalk samples were collected at 0, 2, 4, 6, 8, and 10 weeks after treatment (WAT) • Samples were ground, crushed, and juice was analyzed for Brix and apparent sucrose • Theoretical yields were calculated

  9. Treatments at Okeelanta • Untreated control • Trinexapac at 250g ai/ha • Trinexapac at 300 g ai/ha • Trinexapac at 350 g ai/ha • Glyphosate (Touchdown) 176 g ai/ha • Glyphosate (Touchdown) 209 g ai/ha

  10. Okeelanta Results • Data were subjected to ANOVA • Brix and apparent sucrose were not significantly affected by treatment, except at the 6 WAT sampling • Glyphosate at 209 g/ha and trinexapac at 250 g/ha were significantly greater than the untreated control • Theoretical yield was not significantly affected by treatment

  11. Trends at Okeelanta • At 2 and 4 WAT, Brix, apparent sucrose, and theoretical yield were slightly higher with glyphosate • By 6 WAT, trinexapac was similar to glyphosate • Low rates of trinexapac ranked highest at 10 WAT

  12. Treatments at EREC • Untreated control • Trinexapac at 250g ai/ha • Trinexapac at 300 g ai/ha • Trinexapac at 350 g ai/ha • Glyphosate (Touchdown) 176 g ai/ha • Glyphosate (Touchdown) 209 g ai/ha • Glyphosate (Touchdown) 314 g ai/ha • Glyphosate (Polado) 176 g ai/ha • Glyphosate (Polado) 209 g ai/ha • Glyphosate (Polado) 314 g ai/ha

  13. EREC Results • Data were subjected to ANOVA • Brix, apparent sucrose, and theoretical yield were not significantly affected by treatment • Data were highly variable • Difficult to distinguish trends

  14. EREC Observations • The high rates of glyphosate tended to rank among the top 3 treatments at the 4, 6, and 8 WAT samplings • Trinexapac treatments typically ranked higher than the untreated control, but lower than the glyphosate treatments.

  15. Conclusions • Results are promising, but more work is needed • Actual impact of hurricanes is unknown, but was likely minor • Assuming that ratoon stand counts are not reduced trinexapac has the potential to fit into harvest system • Potential for extending harvest window • Used to ripen non-take out fields that need to be harvested but are not naturally mature

  16. Further Research • Does treatment with trinexapac affect stand count and quality in subsequent ratoons? • Are there differences in response among cultivars?

  17. Questions?

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