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Wheat Plant Density Influences Jointed Goatgrass (Aegilops cylindrica) Competitiveness

Published online by Cambridge University Press:  20 January 2017

Brady F. Kappler ,
Drew J. Lyon ,
Phillip W. Stahlman ,
Stephen D. Miller  and
Kent M. Eskridge
Brady F. Kappler*
Affiliation:
University of Nebraska Panhandle Research and Extension Center, 4502 Avenue I, Scottsbluff, NE 69361
Drew J. Lyon
Affiliation:
University of Nebraska Panhandle Research and Extension Center, 4502 Avenue I, Scottsbluff, NE 69361
Phillip W. Stahlman
Affiliation:
Kansas State University Agricultural Research Center—Hays, 1232 240th Avenue, Hays, KS 67601
Stephen D. Miller
Affiliation:
University of Wyoming, Plant Science Division, Laramie, WY 82071
Kent M. Eskridge
Affiliation:
Department of Biometry, 103 Miller Hall, University of Nebraska, Lincoln, NE 68583-0630
*
Corresponding author's E-mail: bkappler1@unl.edu.
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Abstract

Jointed goatgrass is a problem weed in winter wheat production areas of the Great Plains. Winter wheat seeding rates are easily adjusted by the growers and influence competition by some weeds. Field experiments were initiated in Kansas, Nebraska, and Wyoming using winter wheat cultivars selected from leading adapted cultivars from each region to determine the effect of wheat plant density in the fall on jointed goatgrass competitiveness. Three winter wheat seeding rates (50, 67, and 84 kg seeds/ha) were used at Hays, KS, and Sidney, NE, and four seeding rates (33, 50, 67, and 101 kg seeds/ha) were used at Torrington and Archer, WY. An analysis of covariance model was fit with winter wheat fall plant density as the covariate. In 1996, winter wheat grain contamination (dockage) was reduced at the rate of about 6% for every 10 additional wheat plants/m2 above the threshold density of 70 plants/m2 at Archer, WY, and at the rate of about 0.5% for every 10 additional wheat plants/m2 above the threshold density of 110 plants/m2 at Hays, KS. At Hays the reduction occurred only with the semidwarf cultivar ‘Vista’. Increased wheat density reduced jointed goatgrass reproductive tillers in four out of six location–year combinations and biomass in two out of four location–year combinations. Despite the lack of a consistent reduction in jointed goatgrass competitiveness as the result of increased wheat density, increased seeding rates may be a good, low-cost, long-term investment as part of an integrated jointed goatgrass control program in winter wheat.

Keywords

Jointed goatgrassAegilops cylindrica Host. #3 AEGCY; winter wheatTriticum aestivum L.Interferenceplant competition
Type
Research
Information
Weed Technology , Volume 16 , Issue 1 , March 2002 , pp. 102 - 108
Copyright
Copyright © Weed Science Society of America 

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