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Nitrogen and green foxtail (Setaria viridis) competition effects on corn growth and development

Published online by Cambridge University Press:  20 January 2017

R. Jason Cathcart  and
Clarence J. Swanton
R. Jason Cathcart
Affiliation:
Department of Plant Agriculture, University of Guelph, Guelph, ON, Canada N1G 2W1
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Abstract

Agronomic research on the effects of nitrogen fertilizer and weed control in corn has focused primarily on maintaining or increasing yield. Few studies have examined the effect of nitrogen (N) fertilizer rate or weed competition (or both) on whole plant growth and development. The objectives of this research were to determine how N influences the growth and development of corn and to explore how green foxtail density affects this relationship. Field experiments were conducted on a sandy low organic matter soil from 1999 to 2001. The experiment was designed as a factorial with N rate ranging from 0 to 200 kg N ha−1 and targeted green foxtail density ranging from 0 to 300 plants m−2. Under weed-free conditions, a higher rate of N fertilizer increased corn leaf and grain N content, leaf area index (LAI), plant height, and aboveground dry matter (DM) production, including kernel weight. However, in the presence of green foxtail, corn leaf N content, LAI, growth rate, plant height, and aboveground DM were reduced at each N level. Despite having significant main effects, there was no interaction between N rate and green foxtail density. Results indicate that in corn grown on a coarse-textured soil with low organic matter, the additional stress brought about by the presence of green foxtail exacerbated the effect of low N rates on corn growth and development. More intensive weed management may be required in corn if N fertilizer rates are reduced.

Keywords

Green foxtail, Setaria viridis (L.) Beauv. SETVIcorn, Zea mays L. ‘Pioneer 3905’Corn growth ratedry matter productionkernel weightleaf area indexweed competition
Type
Weed Management
Information
Weed Science , Volume 52 , Issue 6 , December 2004 , pp. 1039 - 1049
Copyright
Copyright © Weed Science Society of America 

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