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C.W. Bednarz and W.D. Shurley University of Georgia and W.S. Anthony USDA-ARS

Losses in Yield, Quality, and Profitability of Cotton From Improper Harvest Timing. C.W. Bednarz and W.D. Shurley University of Georgia and W.S. Anthony USDA-ARS. http://www.cottoninc.com/online/index.cfm. http://www.cottoninc.com/online/index.cfm. IS THIS PROBLEM DUE TO:.

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C.W. Bednarz and W.D. Shurley University of Georgia and W.S. Anthony USDA-ARS

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  1. Losses in Yield, Quality, and Profitability of Cotton From Improper Harvest Timing C.W. Bednarz and W.D. Shurley University of Georgia and W.S. Anthony USDA-ARS

  2. http://www.cottoninc.com/online/index.cfm

  3. http://www.cottoninc.com/online/index.cfm

  4. IS THIS PROBLEM DUE TO: ENVIRONMENT? Soil Type MANAGEMENT? Varieties Population Densities Insect Control Harvest Timing

  5. PERCENT HARVESTED BY WEEK(5 year average)http://www.nass.usda.gov

  6. Cotton and Peanut “Most Active” Planting and Harvest Dates http://www.nass.usda.gov

  7. What is This Harvest Delay Costing Us?(Objectives of Study) • Investigate the effects of harvest timing on fiber properties in general and percent uniformity in particular. • Investigate the effects of harvest timing on lint yield. • Investigate the effects of harvest timing on profitability.

  8. Cotton Defoliation Timing Study CPES - Ponder Farm • Established 13 treatments (weeks) in the study area. • Applied harvest aids every week for 13 weeks (NACB and %OB) • Machine picked each plot two weeks after applying harvest aids. • Seed cotton ginned on mini gin and the USDA-ARS Lab. • HVI and AFIS on lint samples (3 per plot). • Data subject to ANOVA.

  9. Harvest Dates

  10. Uniformity 1998 a a a a a a a a ab ab ab ab b P>F 0.0929

  11. Uniformity 1999 a ab abc abc bcd bcd bcd cd cd cd cd de e P>F 0.0026

  12. Uniformity 2000 ab a ab abc bc bc cd cd d d d d d P>F 0.0017

  13. L(n)CV 1999 a a ab ab ab bc bc c c c c c c F = 4.17**

  14. L(n)CV 2000 a a ab ab abc abc bc bcd cde cde de e e F = 6.19**

  15. Why is Uniformity Changing? • Increasing up to 70% OB • Crop Maturity? • Non-determinate Crop • Decreasing after 70% OB • Crop Weathering?

  16. Strength 1998 a b bc c c cde cde cd def de ef f f P>F 0.0001

  17. Strength 1999 ab a a ab ab abc bc bc cd d d d d P>F 0.0001

  18. Strength 2000 a a b bc bcd cdef bcde def efg fg fg fg g F = 13.91**

  19. HVI-UHM 1998 a a a a a a a a a a a a a P>F 0.1699

  20. HVI-UHM 1999 a a a a a a a a a a a a a P>F 0.0833

  21. HVI-UHM 2000 a ab abc abc abc abc bcde bcde def cdef def f f F = 3.94**

  22. AFIS-Length(n) 1999 a a a a a ab abc bcd bcd bcd cd bcd d P>F 0.0006

  23. AFIS-Length(n) 2000 a ab cd abc bcd cd de efg defg defg fg g g F = 8.70**

  24. AFIS-SFC(w) 1999 abc ab a abc abc abcd bcd bcd cd d d d d P>F 0.0071

  25. AFIS-SFC(n) 2000 a a ab abc bcd bc cde def def efg fg fg g F = 9.24**

  26. HVI Micronaire 1998 a ab a ab ab ab ab ab a ab bc c c P>F 0.0011

  27. HVI Micronaire 1999 abc abc abc abc abc ab ab bcd cd d a e e P>F 0.0001

  28. HVI Micronaire 2000 bcde bcd bc a bc bcde ab ab e cde de f g F = 59.40**

  29. Rainfall During Harvest

  30. Color Grades

  31. Sum of Premiums/Discounts

  32. Lint Yields

  33. CONCLUSIONSApplication of Harvest-Aids at 60-80% Open Boll: • Maximized • Length Uniformity • Fiber Length • Lint Yield (1999) • Profit (1999) • Minimized • Short Fiber Content

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