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Effect of Irrigation on Quackgrass (Agropyron repens) Interference in Soybeans (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Frank L. Young ,
Donald L. Wyse  and
Robert J. Jones
Frank L. Young
Affiliation:
Dep. of Agron. and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108
Donald L. Wyse
Affiliation:
Dep. of Agron. and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108
Robert J. Jones
Affiliation:
Dep. of Agron. and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108
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Abstract

Research was conducted at Rosemount, Minnesota in 1979 and 1980 to evaluate the effect of soil moisture on quackgrass [Agropyron repens (L.) Beauv. # AGRRE] interference in soybeans [Glycine max (L.) Merr.]. Four treatments were studied: 1) nonirrigated soybeans, 2) irrigated soybeans, 3) nonirrigated soybeans, quackgrass-infested, and 4) irrigated soybeans, quackgrass-infested. Percent N, P, and K of soybeans was not affected by quackgrass interference. Irrigation did not increase the yield of quackgrass-free soybeans. The yield of quackgrass-infested soybeans was increased by irrigation when soil moisture was limited, but yields were always less than quackgrass-free soybeans. Quackgrass was nearly the same height or taller than the soybeans at all stages of soybean development and offered substantial competition for light throughout the growing season. This research indicates that an adequate supply of soil moisture can reduce quackgrass interference in soybeans, but cannot eliminate it, since quackgrass apparently continues to compete with soybeans for light.

Keywords

Leaf arealeaf water potentialsoil moistureplant tissue analysisAGRRE
Type
Research Article
Information
Weed Science , Volume 31 , Issue 5 , September 1983 , pp. 720 - 727
Copyright
Copyright © 1983 Weed Science Society of America 

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References

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