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Influence of Nitrogen Application Timing on Low Density Giant Ragweed (Ambrosia trifida) Interference in Corn

Published online by Cambridge University Press:  20 January 2017

W. G. Johnson ,
E. J. Ott ,
K. D. Gibson ,
R. L. Nielsen  and
T. T. Bauman
W. G. Johnson*
Affiliation:
Purdue University, 915 W. State Street, West Lafayette, IN 47907
E. J. Ott
Affiliation:
Purdue University, 915 W. State Street, West Lafayette, IN 47907
K. D. Gibson
Affiliation:
Purdue University, 915 W. State Street, West Lafayette, IN 47907
R. L. Nielsen
Affiliation:
Purdue University, 915 W. State Street, West Lafayette, IN 47907
T. T. Bauman
Affiliation:
Purdue University, 915 W. State Street, West Lafayette, IN 47907
*
Corresponding author's E-mail: wgj@purdue.edu
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Abstract

Field experiments were conducted to evaluate the influence of three nitrogen fertilizer application timings on corn and giant ragweed dry weight, corn and giant ragweed nitrogen accumulation, and corn grain yield. By the V8 growth stage, corn plants in treatments which included nitrogen at planting accumulated up to 27% more dry weight and 26% more leaf area than corn in sidedress-only treatments that had not yet received any fertilizer nitrogen. Nitrogen fertilizer application timing did not influence early-season giant ragweed dry weight, but did influence N accumulation. Giant ragweed at 0.5 plants/m2 accumulated up to 16 kg N/ha in 40-cm-tall plants by the V8 corn growth stage and up to 104 kg N/ha when allowed to remain in corn until the end of the growing season. At this density of giant ragweed, corn yields were not reduced if removed by the V8 corn growth stage. However, season-long interference reduced corn yields by up to 19% regardless of nitrogen application timing. Early-season giant ragweed growth was less responsive to nitrogen application timing than corn, suggesting that nitrogen management programs should not be altered significantly to influence giant ragweed competitiveness in corn. However, giant ragweed should be removed in a timely manner to minimize nitrogen accumulation in nitrogen-limiting corn production situations.

Keywords

Giant ragweed, Ambrosia trifida L. AMBTRcorn, Zea mays L. ‘DKC60-09RR2/YGCB’ and ‘DKC61-45RR/YGCB’Corn yieldnitrogen accumulationweed competition
Type
Research
Information
Weed Technology , Volume 21 , Issue 3 , September 2007 , pp. 763 - 767
Copyright
Copyright © Weed Science Society of America 

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