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Title: EFFECT OF ADJUVANTS ON KIH-9201 DEFOLIANT

Author
item WILLS, G - MSU, DREC
item Hanks, James
item JONES, E - MSU, DREC
item MACK, R - MSU, DREC

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: 1/10/2004
Publication Date: 6/1/2004
Citation: Wills, G.D., Hanks, J.E., Jones, E.J., Mack, R.E. 2004. Effect of adjuvants on KIH-9201 defoliant. National Cotton Council Beltwide Cotton Conference. 2004 CDROM, p. 2220.

Interpretive Summary: No summary required for an abstract.

Technical Abstract: A field study was conducted during 2003 to compare the effects of the cotton defoliant, KIH-9201 alone and in combination with various adjuvants; the fertilizer salt, ammonium sulfate; the growth regulator, Ethephon-6®; and of the cotton defoliant, Def-6® in combination with Ethephon-6, Dropp® defoliant, Finish® defoliant, and the adjuvant, HM-0307, and of Finish alone. Treatments were applied in water at 10 gallons per acre (gpa) to cotton in plots of four rows each, spaced 40 inches apart, 40 feet long, replicated four times, and arranged in a randomized complete block design. Visual ratings were made of the percent defoliation at 7 and 14 days after treatment (DAT) and the percent shoot regrowth at 21 DAT, whereby 0 = no effect and 100% = complete effect. Results in this study showed that the defoliant, KIH-9201 was most effective when applied in combination with the oil-based organosilicone adjuvant, Dyne-Amic® and with the crop oil adjuvant, Agri-Dex® and was least effective in combination with the siloxane water-based organosilicone adjuvant, Kinetic HV® and the nonionic surfactant, Induce® both of which are more effective with water-based formulations. At 7 to 14 DAT respectively, defoliation with KIH-9201 alone was 9 and 10%. Defoliation at 7 and 14 DAT respectively was increased with the addition of Agri-Dex to 65 and 73%, of Dyne-Amic to 75 and 81%, of Dyne-Amic plus Ethephon-6 to 63 and 70%, and of Dyne-Amic plus Ethephon-6 and ammonium sulfate to 76 and 83%. Defoliation was little to nonaffected at 7 to 14 DAT respectively when KIH-9201 was applied in combination with Induce, 20 and 21%, with Kinetic HV, 10 and 14%, and with ammonium sulfate alone, 11 and 14%.