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Competitive Effects of Quackgrass upon Corn as Modified by Fertilization

Published online by Cambridge University Press:  12 June 2017

J. D. Bandeen  and
K. P. Buchholtz
J. D. Bandeen
Affiliation:
University of Wisconsin, Madison Crop Science Department, University of Guelph, Guelph, Ontario
K. P. Buchholtz
Affiliation:
University of Wisconsin, Madison
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Abstract

A field study was made on the competitive effect of quackgrass (Agropyron repens (L.) Beauv.) on corn for the nutrients N, P, and K during 1962 and 1963. Quackgrass competition drastically reduced corn height and yield and delayed maturity. High levels of fertilization did not overcome the effects of quackgrass competition. The annual uptake by quackgrass during the growing seasons of 1962 and 1963 was 105, 15 and 60 lb/A of N, P, and K, respectively. Quackgrass shoots harvested at maturity in mid-July had taken up 55, 45, and 68% of the total N, P, and K, respectively, that was removed throughout the season by quackgrass shoots plus rhizomes. It appeared that the early season uptake of N and K by quackgrass may have contributed to, but was not solely responsible for, the reduction in corn height and yield and delayed maturity noted later in the season.

Type
Research Article
Information
Weeds , Volume 15 , Issue 3 , July 1967 , pp. 220 - 224
Copyright
Copyright © 1967 Weed Science Society of America 

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References

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