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DEFOLIATION TRIAL COMMENTS Summary

Kent Taylor"The project consisted of 14 treatments in 5 trials at 5 locations in 4 row by 100 foot long plots. Sites were selected by participating consultants and treatments were selected by participating companies. Trials were conducted in Miller, Houston, Appling, Laurens, and in Terrell counties. There was a considerable difference in treatment performance at some locations but the overall analysis shows no statistical difference in the treatment means. All trials except for the Terrell County location were initiated under warm clear conditions and were not affected by rainfall. The Terrell County test was initiated under cool clear conditions and was also not affected by rainfall. Rain events occurred at all locations on 9/24 and on 10/6. In addition, there was a shower at Miller County on 9/23. Up until 9/24, temperatures were mostly in the 60 85 degree range but dropped mostly into the 50 79 degree range with some morning lows in the upper 40s after 9/25. Ratings were made at all locations at 6 and 12 days following application to measure speed of defoliation, desiccation, green leaf removal, boll opening, and regrowth. As the ratings indicate, weather conditions were near ideal to promote boll opening, except in Terrell County where treatments were not applied until 9/26. All locations had excellent yield potential. Also, the clear and dry conditions were not very conducive for promoting foliage regrowth. Greatest differences were noted in terms of desiccation and in green leaf removal. Failure to adequately defoliate green leaves is of more concern than desiccation since gins can remove most dry leaf trash but have a more difficult time with green leaves which may result in stain. Green leaves also present stain and moisture problems in modules. Less than 85% green leaf removal would be considered inadequate under most circumstances." -- Kent Taylor , October 11, 2001

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NOTE:  Any person or organization that desires to republish this report may do so as long as the user refers to the Georgia Association of Professional Agricultural Consultants as being the source.

Plot data pages:
  • Paul Brown, Houston County, Plot Data and Ratings.
  • Tim Kelly, Appling County, Plot  Data and Ratings.

 

               
No.

Treatment (and Rate per Acre)

*Price per acre % Defoliation % Desiccation % Green % Open Bolls % Regrowth
6 day rating 12 day rating 6 day rating 12 day rating 6 day rating 12 day rating 6 day rating 12 day rating 6 day rating 12 day rating
# 1 Harvade @ 8 oz. + Folex @ 8 oz. + COC @ 16 oz. 8.06 77.0 a 88.0 a 3.0 a 2.0 a 20.0 a 8.0 a 81.0 a 90.0 a 1.0 a 4.0 a
# 2 Harvade @ 8 oz. + Prep** @ 21.33 oz. + COC @ 16 oz. 12.39 70.0 a 82.0 a 2.0 a 0.0 a 28.0 a 14.0 a 80.0 a 89.0 a 1.0 a 4.0 a
# 3 Leafless @ 12 oz. + COC @ 8 oz. 13.75 65.0 a 80.0 a 2.0 a 2.0 a 33.0 a 16.0 a 80.0 a 90.0 a 1.0 a 2.0 a
# 4 Cotton Quik @ 64 oz. + Aim @ 0.67 oz.*** 16.72 75.0 a 87.0 a 3.0 a 0.0 a 22.0 a 12.0 a 84.0 a 95.0 a 0.0 a 1.0 a
# 5 Cotton Quik @ 64 oz. + Def @ 6 oz. 13.97 72.0 a 86.0 a 4.0 a 1.0 a 24.0 a 10.0 a 84.0 a 95.0 a 1.0 a 3.0 a
# 6 Cotton Quik @ 64 oz. + Freefall @  1.6 oz.*** + Aim @ 0.67 oz.*** 21.92 74.0 a 85.0 a 5.0 a 4.0 a 21.0 a 10.0 a 84.0 a 94.0 a 0.0 a 0.0 a
# 7 Def @ 10 oz. + Prep** @ 32 oz. + Dropp @ 1.6 oz.*** 18.73 81.0 a 92.0 a 2.0 a 1.0 a 17.0 a 6.6 a 86.0 a 96.0 a 1.0 a 0.4 a
# 8 Aim @ 0.67 oz.*** + Super Boll** @ 32 oz. + Freefall @ 1.6 oz.*** + COC @ 12.8 oz.**** 19.92 77.0 a 89.0 a 7.0 a 5.0 a 16.0 a 6.0 a 87.0 a 96.6 a 0.0 a 0.0 a
# 9 Aim @ 0.67 oz.*** + Super Boll** @ 21.33 oz. + COC @ 12.8 oz.**** 11.56 75.0 a 85.0 a 7.0 a 5.0 a 18.0 a 9.0 a 84.0 a 94.6 a 0.0 a 1.0 a
# 10 Aim @ 0.67 oz.*** + Finish** @ 21.33 oz. + Freefall @ 1.6 oz.*** + COC @ 12.8 oz.**** 23.09 79.0 a 90.0 a 7.0 a 5.0 a 14.0 a 4.0 a 84.0 a 95.6 a 0.0 a 1.0 a
# 11 Aim @ 0.67 oz.*** + Finish** @ 21.33 oz. + COC @ 12.8 oz.**** 17.89 81.0 a 91.0 a 4.0 a 1.0 a 16.0 a 7.0 a 87.0 a 95.6 a 0.0 a 1.0 a
# 12 Finish @ 21.33 oz. + Dropp @ 1.6 oz.*** + Folex @ 4 oz. 19.11 80.0 a 92.0 a 1.0 a 0.0 a 19.0 a 7.0 a 85.0 a 95.6 a 0.0 a 1.0 a
# 13 Finish @ 21.33 oz. + Ginstar @ 4 oz. 18.26 81.0 a 92.0 a 0.0 a 0.0 a 19.0 a 7.6 a 86.0 a 94.0 a 0.0 a 0 4 a
# 14 Harvest Boost @ 16 oz.***  + Ethephon** @ 16 oz. + Ginstar @ 4 oz. 16.34 77.0 a 91.0 a 0.0 a 2.0 a 23.0 a 6.6 a 86.0 a 96.0 a 0.0 a 0.4 a
 LSD (P=.05) 19.98 11.16 8.54 6.14 16.54 9.41 13.14 8.66 1.51 3.62
 Standard Deviation 15.79 8.82 6.75 4.86 13.07 7.44 10.39 6.85 1.2 2.86
 CV  20.78 10.04 201 242.75 63.11 84.11 12.34 7.28 418.33 208.89
 Bartlett's X2  5.39 8.631 23.284 20.505 8.587 9.683 5.284 9.705 0 29.578
 P(Bartlett's X2)  0.966 0.8 0.016 0.015 0.803 0.72 0.968 0.718 1 0.002
 Treatment F  0.435 0.957 0.652 0.816 0.763 0.981 0.256 0.67 0.769 1.132
 Treatment Prob(F)  0.9498 0.5035 0.7992 0.6415 0.6944 0.4808 0.9952 0.7828 0.6879 0.3534
Means followed by the same letter do not significantly differ (P=.05, Student-Newman-Keuls). There were no statistical differences between treatments overall in ratings at either 6 or 12 days. Since sites were treated as reps, and there was considerable variation between the reps, it made statistical seperation much more difficult.

*Approximate cost per acre; actual costs will vary.

**All Prep, Super Boll, ethephon, and Finish products used in this project are 6 pound per gallon formulations.

***Aim, Freefall, Dropp, and Harvest Boost formulations are dry weight.

****COC, or Crop Oil Concentrate @ 1% v/v solution.