Full TGIF Record # 8420
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Publication Type:
Author(s):Weir, Edward R.; Harvey, R. Gordon
Author Affiliation:Department of Agronomy, University of Wisconsin, Madison, WI
Title:Influence of Postemergence Herbicides on Quality of Quackgrass (Agropyron Repens (L.) Beauv.) Infested Alfalfa Forage.
Meeting Info.:Conference held December 10-12, St.Louis, Missouri
Source:Proceedings of the North Central Weed Control Conference. Vol. 40, December 1985, p. 67.
Publishing Information:Omaha, NB
Keywords:TIC Keywords: Postemergence herbicides; Elymus repens; Neutral detergent fiber; Forage crops
Abstract/Contents:"Quackgrass control in established alfalfa is an important factor in the improvement of forage quality. Field studies in Wisconsin in 1984 and 1985 at Arlington and in 1985 at Ashland were conducted to determine the effects of postemergence herbicides on forage quality. Mefluidide applied at 0.12 and 0.25 lb/a, fluazifop-P at 0.06 and 0.12 lb/a with Atplus 411F crop oil concentrate, and a no herbicide treatment were used in both trials. Two rates of pronamide, 0.75 and 1.50 lb/a were added to the Arlington trial. Quality parameters were measured using the Van Soest method for neutral detergent fiber (NDF) and acid detergent fiber (ADF) concentrations. Crude protein content was determined using the Cataldo and Schrader colormetric assay of total nitrogen. Forage yield decreased in the first cutting in the herbicide treated plots because of the reduced quackgrass growth. However, total season yield was not significantly different between treated and untreated plots. NDF and ADF values in the first cutting were significantly lower in treated plots at Arlington in 1984 and at Ashland in 1985. ADF values were lower in the treated plots at Arlington in 1985. Crude prote in content was improved in treated plots in the first cutting at Arlington in 1984 and at Ashland in 1985. Variation in forage quality at Arlington in 1985 may have been reduced because of lower than normal rainfall in the early spring which made the quackgrass less competitive. A second field trial at Arlington in 1985 included BAS-51702, DPX-Y6202, RO-173664, SC-1084, and sethoxydim, as well as fluazifop-P and mefluidide. All treatments reduced quackgrass growth and total forage yield in the first cutting. Total yield was not affected.
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Weir, E. R., and R. G. Harvey. 1985. Influence of Postemergence Herbicides on Quality of Quackgrass (Agropyron Repens (L.) Beauv.) Infested Alfalfa Forage.. Proc. North Cent. Weed Sci. Soc. 40:p. 67.
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