Full TGIF Record # 12502
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Publication Type:
Author(s):Dekker, Jack
Author Affiliation:Assistant Professor, Crop Science Department, University of Guelph, Guelph, Ontario, Canada
Title:Effect of rate, carrier volume and additives on glyphosate and sulphosate activity in quackgrass rhizomes
Section:Physiology, edaphic factors and control of specific weeds
Other records with the "Physiology, edaphic factors and control of specific weeds" Section
Meeting Info.:Winnipeg, Manitoba, Canada: December 4-6, 1984
Source:Proceedings: North CentralWeed Control Conference. Vol. 39, 1984, p. 98-99.
# of Pages:2
Publishing Information:[Urbana, Illinois: Department of Agronomy, University of Illinois]
Keywords:TIC Keywords: Application rates; Additives; Glyphosate; Elymus repens; Rhizomes
Abstract/Contents:"Field evaluations were conducted in a heavy infestation of quackgrass (Agropyron repens) at the Elora Research Station, Wellington Co., Ontario to determine the effect of several factors on quackgrass rhizome dry weights in 1983 and 1984 from applications made only in 1983. These factors included glyphosate rate (0.5 to 1 and 2 kg/ha); carrier volume (225 L/ha and 75 L/ha); glyphosate plus additives (28% liquid nitrogen at 50 kg/ha actual N; FrigateTM [tallow fatty acid amine ethoxylate]); and a comparison of glyphosate and sulphosate (SC-0224). The experimental design was a randomized complete block with three replications. The treatments were applied on 18 May 1983 to untilled quackgrass in the four leaf stage. The entire experiment was moldboard plowed on 31 May 1983 to a depth of 20 cm. On 10 June 1983 the field was prepared and soybeans (cv. 'Maple Arrow') were planted. No crop was grown in 1984. Four or five determinations per year were made on quackgrass shoot and rhizome dry weights in 0.36 m2 subplots. Untreated quackgrass rhizome weight decreased in early 1983; probably due to the effects of tillage and mobilization of carbohydrate reserves for shoot growth. Untreated rhizome weights remained constant for the remainder of 1983; probably due to summer (heat) dormancy and soybean interference. Untreated rhizome weights increased throughout 1984; probably due to ample nitrogen from 1983 soybean residues and the lack of crop interference. Glyphosate at 0.5 kg/ha applied at the low carrier volume reduced quackgrass rhizome weight earlier in 1983 than did 1 kg/ha in low volume. At most harvest dates 1 kg/ha (low volume) was more effective than 0.5 kg/ha (low volume). Glyphosate at 1 kg/ha reduced rhizome weights earlier in 1983 than did 2 kg/ha. At most 1984 harvest dates 2 kg/ha was more effective than 1 kg/ha. In general, in each case the lower glyphosate rate was more effective in the year (1st) of applications; the advantage of the higher rate was not realized until the year (2nd) following applications. Glyphosate at 1 kg/ha delivered in standard water carrier volumes (225L/ha) reduced quackgrass rhizome weights to a greater extent than it did when the same rate was delivered in lower volumes at most harvest dated in 1983. Rhizome reductions associated with the higher carrier volume commenced sooner in 1983 than did those associated with the lower carrier volume. The advantages in rhizome reductions with the higher volume were lost in the second season (1984) following application. The greater efficacy of glyphosate at 1 kg/ha plus Frigate in reducing rhizome weights at the July, 1983 harvest date was offset in early September, 1983 by greater rhizome weight reductions associated with glyphosate alone and with 28% UAN nitrogen solution amendments. Rhizome reductions caused by all three glyphosate (1 kg/ha) treatments were similar at the end of 1984. The advantages of using the two additives was apparent in the second season (1984) following application: at several different harvest dates the addition of 28% UAN or Frigate led to greater rhizome reductions than those associated with applying glyphosate alone. When both herbicides were delivered in 75 L/ha at 1 kg/ha: a) sulhosate reduced weights to a greater extent than glyphosate in the first half of 1983; and, sulphosate reductions commenced sooner in 1983 than those associated with glyphosate; b) differences between the two herbicides in reducing rhizome weights in 1984 were not apparent at most harvest dates. When both herbicides were applied at 2 kg/ha. Sulphosate reduced rhizome weights to a greater extent than glyphosate in the second half of 1983, and at most harvest dates in 1984; and, sulphosate reductions commenced sooner in 1983 than those associated with glyhphosate."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dekker, J. 1984. Effect of rate, carrier volume and additives on glyphosate and sulphosate activity in quackgrass rhizomes. Res. Rep. North Cent. Weed Control Conf. 39:p. 98-99.
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