Slide Presentation

TITLE    (click title to view slides)
Peanut Response to Soil-Applied Liberty® (Glufosinate)

AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia

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TABLE OF CONTENTS
  1. Peanut Response to Soil-Applied Liberty® (Glufosinate)
  2. Glufosinate
  3. Preplant Liberty (glufosinate) for Peanut?
  4. Objective
  5. Trial Locations - 2020
  6. Material and Methods - I General
  7. Material and Methods - II Cultivar/Planting Dates/Application Dates
  8. Material and Methods - III Soil Types
  9. Materials and Methods - IV Application Equipment
  10. Results
  11. Liberty Timing and Rate Effects on Peanut Density - Georgia
  12. Liberty Timing and Rate Effects on Peanut Density - South Carolina
  13. Peanut Response to Liberty (GA) - 30 DAP
  14. Peanut Response to Liberty (GA) - 55 DAP
  15. Peanut Response to Liberty (GA) - 86 DAP
  16. Peanut Response to Liberty (GA) - 118 DAP
  17. Yield
  18. Liberty Timing and Rate Effects on Peanut Yield (lbs/A) - Arkansas
  19. Liberty Timing and Rate Effects on Peanut Yield (lbs/A) - Georgia
  20. Liberty Timing and Rate Effects on Peanut Yield (lbs/A) - South Carolina
  21. Liberty Timing and Rate Effects on Peanut Yield (lbs/A) - Texas
  22. Summary/Conclusions
  23. Questions/Comments?



SLIDE CONTENTS
  1. Peanut Response to Soil-Applied Liberty® (Glufosinate) Eric P. Prostko and Chad C. Abbott (UGA) Thomas R. Butts (UARK) W. James Grichar (TAMU) Michael W. Marshall (Clemson)
  2. Glufosinate First discovered in 1981 Commercialized in 1993 phosphinic acid glutamine synthetase inhibitor WSSA Group 10 PPLNT burndown and POST in tolerant crops Many formulations are available.
  3. Preplant Liberty (glufosinate) for Peanut? Why? used extensively in GA cotton so its around the farm and growers are very familiar with it. Could be helpful for horseweed, morningglory, and pigweed control prior to planting Peanut control for replant prevent off-label usage Current labeled rotation = 180 days
  4. Objective Evaluate peanut response to soil-applied applications of Liberty (glufosinate)
  5. Trial Locations - 2020 Blackville (SC) Newport (AR) Ty Ty (GA) Yoakum (TX)
  6. Material and Methods – I General Standard small-plot techniques 3-4 reps RCB with factorial (2 X 3) Timing 1 DBP or 1 DAP Liberty 2.34SL Rates 0, 32, or 64 oz/A Weed-free Data Collection: density (stand), height, width, yield ANOVA (P=0.10) Fisher’s Protected LSD No interactions between timing and rate (P=0.1209)
  7. Material and Methods - II Cultivar/Planting Dates/Application Dates aDBP = days before planting; DAP = days after planting
  8. Material and Methods – III Soil Types
  9. Materials and Methods – IV Application Equipment
  10. Results
  11. Liberty Timing and Rate Effects on Peanut Density - Georgia 20 DAP Time of Application P = 0.5344 CV = 11.81 Liberty 2.34SL Rate (oz/A) P = 0.0687 LSD 0.10 = 1.0/CV = 5.24
  12. Liberty Timing and Rate Effects on Peanut Density – South Carolina 21 DAP Time of Application P = 0.0354 LSD 0.10 = 0.8/CV = 2.24 Liberty 2.34SL Rate (oz/A) P = 0.1327 CV = 2.42
  13. Peanut Response to Liberty (GA) PE-21-20 June 25 30 DAP No Liberty Liberty @ 64 oz/A 7 DBP + 1 DAP
  14. Peanut Response to Liberty (GA) PE-21-20 July 20 55 DAP No Liberty Liberty @ 64 oz/A 7 DBP + 1 DAP
  15. Peanut Response to Liberty (GA) PE-21-20 August 20 86 DAP No Liberty Liberty @ 64 oz/A 7 DBP + 1 DAP
  16. Peanut Response to Liberty (GA) PE-21-20 September 21 118 DAP No Liberty Liberty @ 64 oz/A 7 DBP + 1 DAP
  17. Yield
  18. Liberty Timing and Rate Effects on Peanut Yield (lbs/A) - Arkansas Time of Application P = 0.3111 CV = 33.14 Liberty 2.34SL Rate (oz/A) P = 0.2649 CV = 38.78
  19. Liberty Timing and Rate Effects on Peanut Yield (lbs/A) - Georgia Time of Application P = 0.5675 CV = 6.4 Liberty 2.34SL Rate (oz/A) P = 0.2322 CV = 4.5
  20. Liberty Timing and Rate Effects on Peanut Yield (lbs/A) – South Carolina Time of Application P = 0.4241 CV = 13.85 Liberty 2.34SL Rate (oz/A) P = 0.0826 LSD 0.10 = 461/CV = 12.28
  21. Liberty Timing and Rate Effects on Peanut Yield (lbs/A) - Texas Time of Application P = 0.6254 CV = 29 Liberty 2.34SL Rate (oz/A) P = 0.8470 CV = 15.6
  22. Summary/Conclusions Generally, peanut tolerance to Liberty was very acceptable No interactions between timing and rate (P = 0.1209) Peanut Stand Rate Effect (GA) Reduced 6% by 64 oz/A Timing Effect (SC) Reduced 3.1% by 1 DAP No negative effects of timing or rate on peanut yield 32 oz/A = 64 oz/A > 0 oz/A (SC)
  23. Questions/Comments?