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Competition of Smooth Pigweed with Corn and Soybeans

Published online by Cambridge University Press:  12 June 2017

Moti K. Moolani ,
Ellery L. Knake  and
Fred W. Slife
Moti K. Moolani
Affiliation:
Indian Institute of Technology, Kharagpur, India Department of Agronomy, University of Illinois, Urbana, Illinois
Ellery L. Knake
Affiliation:
Department of Agronomy, University of Illinois, Urbana, Illinois
Fred W. Slife
Affiliation:
Department of Agronomy, University of Illinois, Urbana, Illinois
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Abstract

Yield reductions from the heaviest stand of smooth pigweed (Amaranthus hybridus L.) averaged 39% for corn and 55% for soybeans. For corn the increase in pigweed dry matter about equalled the decrease in the dry matter from the crop; the total dry matter yield was relatively constant. Pigweed grew taller than soybeans, and the dry weight of crop plus pigweeds was 1⅓ times that of weed-free soybeans. As stand of pigweed was increased, there was a decrease in yield of grain, cobs and stalks or straw, diameter of cornstalks, height of crop, and soybean pods per plant. Yield reductions obtained emphasize the importance of both chemical and cultural measures for reducing competition between row crops and weeds.

Type
Research Article
Information
Weeds , Volume 12 , Issue 2 , April 1964 , pp. 126 - 128
Copyright
Copyright © 1964 Weed Science Society of America 

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References

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