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Seedling Growth Responses of Buffelgrass (Pennisetum ciliare) to Tebuthiuron and Honey Mesquite (Prosopis glandulosa)

Published online by Cambridge University Press:  12 June 2017

G. Allen Rasmussen ,
Roger P. Smith  and
Charles J. Scifres
G. Allen Rasmussen
Affiliation:
Dep. Range Sci., Texas A&M Univ., College Station, TX 77843 Res. Asst., Dep. Range and Wildlife Manage., Texas Tech. Univ., Lubbock, TX 79409
Charles J. Scifres
Affiliation:
Dep. Range Sci., Texas A&M Univ., College Station, TX 77843
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Abstract

Tebuthiuron {N-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl]-N,N′-dimethylurea} at 2 or 4 ppmw placed 0 to 3, 8 to 11, or 15 to 18 cm deep in soil columns reduced root and shoot weights of buffelgrass [Pennisetum ciliare (L.) Link # PESCI] 30 days after emergence. Plains bristlegrass (Setaria macrostachya H.B.K.) seedling shoot weights were not reduced when 2 ppmw tebuthiuron was placed 8 to 11 cm deep or deeper. Effects of tebuthiuron at 0.13 to 0.50 ppmw on buffelgrass shoot and net tiller production were not moderated by the presence of honey mesquite (Prosopis glandulosa # PRCJG) in the pots. However, regardless of tebuthiuron dosage, average height and shoot weight of buffelgrass seedlings were greater when seedlings were grown in soil collected from beneath honey mesquite canopies compared to growth in soil from interspaces. Therefore, spatial variations in buffelgrass response to applications of tebuthiuron for control of invading shrubs may largely be attributed to soil changes induced by woody plants rather than to presence of shrubs.

Keywords

Range grassesgrass-shrub competitionSetaria macrostachyaPESCIPRCJG
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 34 , Issue 1 , January 1986 , pp. 88 - 93
Copyright
Copyright © 1986 by the Weed Science Society of America 

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