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Planting Geometry of Winter Wheat (Triticum aestivum) Can Reduce Jointed Goatgrass (Aegilops cylindrica) Spikelet Production

Published online by Cambridge University Press:  12 June 2017

Frank L. Young ,
Steven S. Seefeldt  and
Gwen F. Barnes
Frank L. Young*
Affiliation:
Washington State University, Pullman, WA 99164
Steven S. Seefeldt
Affiliation:
Washington State University, Pullman, WA 99164
Gwen F. Barnes
Affiliation:
Sandoz Agro, Inc., 118 S University Street, Vermillion, SD 57069-3214
*
Corresponding author's E-mail: [email protected].
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Abstract

A 1984–1985 and 1988–1989 field study near Pullman, WA, evaluated the effect of two winter wheat planting geometries on the growth of wheat and competition against jointed goatgrass. Treatments included paired and constant row planting geometries of wheat and locations of jointed goatgrass within each geometry. No planting geometry by weed location interactions occurred at any harvest date for plant height, shoot number, leaf area, plant dry weight, or N uptake for either wheat or jointed goatgrass. During the 1984–1985 growing season, N uptake data indicated that by heading, jointed goatgrass had taken up N that had been deep-banded between wheat rows located 25 cm from the weed. Winter wheat yields were not different in the paired-row and the constant row spacing geometry in a weed-free environment. Within years, for both planting geometries, winter wheat yield reduction from weed competition was similar for the jointed goatgrass locations. In contrast, based on jointed goatgrass spikelets produced, wheat grown in paired-rows was more competitive against jointed goatgrass compared to constant row spacing.

Keywords

Jointed goatgrass, Aegilops cylindrica Host # AEGCYwheat, Triticum aestivum L.Deep-banded fertilizerfertilizer placementconstant row spacingpairedrowPM, physiologic maturityPNW, Pacific Northwest
Type
Research
Information
Weed Technology , Volume 13 , Issue 1 , March 1999 , pp. 183 - 190
Copyright
Copyright © 1999 by the Weed Science Society of America 

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