Full TGIF Record # 15203
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Spitzmueller, Joseph; Wyse, Donald
Author Affiliation:Dept. of Agronomy and Genetics, University of Minnesota, St. Paul, MN.
Title:Influence of Ammonium Sulfate on Quackgrass [Agropyron repens (L.) Beauv.] Crown Buds.
Meeting Info.:Held: December 13-15, 1988, Minneapolis, MN.
Source:Proceedings of the North Central Weed Control Conference. Vol. 43, December 1988, p. 86-87.
Publishing Information:Omaha, NB: North Central Weed Control Conference
Keywords:TIC Keywords: Elymus repens; Ammonium Sulfate; Buds; Sethoxydim
Abstract/Contents:"Ammonium sulfate (AMS) has been successfully used in combination with postemergence herbicides to increase efficacy on annual weeds, but in our research it has not been proven to be effective in use on quackgrass. Quackgrass is a perennial weed that is propagated vegetatively through buds on rhizomes and buds on crown tissue at the base of the culm. Reports in the literature indicate that limited herbicide uptake in the crown buds is the major reason for the lack of quackgrass control with herbicides such as sethoxydim and fluazifop. Studies have shown that exogenous N applications, stimulate bud growth in quackgrass and may potentially increase the amount of herbicide translocated to these buds. In our initial experiments, herbicide efficacy was not increased by tank mixing AMS with several postemergence herbicides. To determine why AMS was not effective, we conducted experiments to determine the influence of AMS on quackgrass crown buds. Tank mixtures of AMS and sethoxydim resulted in increased absorption and overall translocation, but much of the herbicide remained in the leaf and stem tissue and did not translocate to the crown buds. No effect on longterm quackgrass control was observed. Splitting AMS and sethoxydim treatments by seven days did not increase sethoxydim absorption or overakk translocation, but did result in increased bud size and sink intensity. The buds that were affected were those growing inside the sheaths of the collared leaves. Since these buds give rise to new shoots, this appears to be the reason we observed an increase in short term control with split applications; the buds that produced new shoots became stronger sinks for sethoxydim and were controlled. Quackgrass also produces several buds that grow inside the sheaths of scale leaves (rhizome buds) that are also located below the soil surface but are not influenced by AMS applications. Therefore, since neither tank mixture nor split applications of AMS enhanced control of the buds that produce rhizome growth, we do not see an effect on long term control."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Spitzmueller, J., and D. Wyse. 1988. Influence of Ammonium Sulfate on Quackgrass [Agropyron repens (L.) Beauv.] Crown Buds.. Proc. North Cent. Weed Sci. Soc. 43:p. 86-87.
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