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DEFOLIATION TRIAL COMMENTS
By: Kent Taylor
2002 DEFOLIATION PROJECT SUMMARY (IRRIGATED COTTON)
Trials were established at 5 locations to evaluate defoliants. Locations were selected by consultants and treatments were selected by participating company representatives. Applications were made daily in a 5 day period beginning on September 30 and ending on October 4. Ratings were made at 7 and 14 days following treatment application. The tests were scheduled to have started 2 weeks earlier but inclement weather forced their postponement. Therefore, cotton at the test sites was more mature than first planned. Locations are discussed individually as follows:
NOTE: Although not statistically different, there are some major differences in performance in some trials. Over 10% green leaves remaining or over 10% desiccation remaining would be unacceptable by most standards.
(and Rate per Acre)
|*Price per acre||% Defoliation||% Desiccation||% Green||% Open Bolls||% Regrowth|
|7 day rating||14 day rating||7 day rating||14 day rating||7 day rating||14 day rating||7 day rating||14 day rating||7 day rating||14 day rating|
|# 1||Leafless @ 12 oz. + Prep @ 21.33 oz. + COC @ 16 oz.||$20.33||78.8 a||81.3 a||5.0 a||0.0 a||16.3 a||18.8 a||91.3 a||97.5 a||3.8 a||8.8 a|
|# 2||Leafless @ 12 oz. + Prep @ 21.33 oz. + Aim @ 0.25 oz. + COC @ 16 oz.||$21.58||78.8 a||86.3 a||10.0 a||0.0 a||11.3 a||13.8 a||92.5 a||98.8 a||2.5 a||6.3 a|
|# 3||Cotton Quik @ 64 oz. + Folex @ 6 oz.||$13.97||81.3 a||76.3 a||0.0 a||0.0 a||18.8 a||23.8 a||93.8 a||100.0 a||10.0 a||15.0 a|
|# 4||FreeFall 50 WP @ 2 oz. (DRY WT.) + Folex @ 12 oz.||$10.44||73.8 a||71.3 a||0.0 a||0.0 a||26.3 a||28.8 a||90.0 a||92.5 a||2.5 a||7.5 a|
|# 5||Dropp @ 1.60 (DRY WT.) + Folex @ 8 oz. + Prep @ 21.33 oz.||$14.16||80.0 a||78.8 a||1.3 a||0.0 a||18.8 a||21.3 a||92.5 a||98.8 a||1.3 a||7.5 a|
|# 6||Resource @ 8 oz. + Prep @ 21.33 oz. + COC @ 16 oz.||$16.10||81.3 a||83.8 a||7.5 a||1.3 a||11.3 a||15.0 a||93.8 a||98.8 a||2.5 a||6.3 a|
|# 7||Resource @ 4 oz. + Prep @ 21.33 oz. + COC @ 16 oz.||$11.89||77.5 a||78.8 a||6.3 a||2.5 a||16.3 a||18.8 a||91.3 a||96.3 a||2.5 a||8.8 a|
|# 8||Aim @ 0.75 oz. + Cotton Quik @ 64 oz. + NIS 0.25% v/v @ 0.25% v/v||$16.45||76.3 a||75.0 a||7.5 a||2.5 a||16.3 a||22.5 a||93.8 a||100.0 a||2.5 a||10.0 a|
|# 9||Aim @ 1.00 oz. + Super Boll (6 LB./GAL.) @ 16 oz. + COC 0.5% v/v @ 0.5% v/v||$10.10||73.8 a||70.0 a||3.8 a||2.5 a||21.3 a||27.5 a||90.0 a||95.0 a||5.0 a||11.3 a|
|# 10||Finish Pro 6 @ 21.33 oz. + Aim @ 1.00 oz. + COC 0.5% v/v @ 0.5% v/v||$18.01||75.0 a||73.8 a||5.0 a||2.5 a||20.0 a||23.8 a||91.3 a||96.3 a||3.8 a||7.5 a|
|# 11||Dropp @ 2.00 oz (DRY WT.) + Aim @ 1.00 oz. + COC 0.5% v/v @ 0.5% v/v||$11.85||78.8 a||80.0 a||1.3.a||0.0 a||21.3 a||20.0 a||88.8 a||93.8 a||2.5 a||5.0 a|
|# 12||Harvest Boost @ 16 oz. (DRY WT.) +Epthephon (6 LB./GAL.) @ 16 oz. + Folex @ 6 oz. + Dyne-Amic @ 4 oz.||$14.12||77.5 a||73.8 a||0.0 a||0.0 a||22.5 a||26.3 a||91.3 a||96.3 a||7.5 a||13.8 a|
|# 13||Harvest Boost @ 16 oz. (DRY WT.) +Epthephon (6 LB./GAL.) @ 16 oz. + Aim @ 0.75 oz. + Dyne-Amic @ 4 oz.||$15.90||78.8 a||78.8 a||3.8 a||1.3 a||17.5 a||20.0 a||91.3 a||96.3 a||7.5 a||8.8 a|
|# 14||Dropp @ 2 oz. (DRY WT.) + Finish Pro 6 @ 21.33 oz. + Def @ 4 oz.||$20.48||81.3 a||83.8 a||5.0 a||0.0 a||13.8 a||16.3 a||91.3 a||96.3 a||3.8 a||6.3 a|
|# 15||Ginstar @ 6 oz. + Finish Pro 6 @ 21.33 oz.||$20.91||82.5 a||86.3 a||6.3 a||0.0 a||11.3 a||13.8 a||92.5 a||96.3 a||3.8 a||6.3 a|
|# 16||Finish Pro 6 @ 21.33 oz. + Def @ 8 oz.||$15.29||80.0 a||72.5 a||0.0 a||0.0 a||20.0 a||27.5 a||92.5 a||97.5 a||10.0 a||16.3 a|
|Means followed by the same letter do not significantly differ (P=.05, Student-Newman-Keuls).||
*Approximate cost per acre; actual costs will vary.
**COC, or Crop Oil Concentrate
***Resource is not currently labeled for cotton defoliation but Valent is working to get it labeled and hopes to have a label maybe as early as next year.