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Integrating Management of Soil Nitrogen and Weeds

Published online by Cambridge University Press:  20 January 2017

Sam E. Wortman ,
Adam S. Davis ,
Brian J. Schutte  and
John L. Lindquist
Sam E. Wortman*
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68583-0915
Adam S. Davis
Affiliation:
USDA-ARS Global Change and Photosynthesis Research Unit, 1102 South Goodwin Avenue, Urbana, IL 61801
Brian J. Schutte
Affiliation:
USDA-ARS Global Change and Photosynthesis Research Unit, 1102 South Goodwin Avenue, Urbana, IL 61801
John L. Lindquist
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68583-0915
*
Corresponding author's E-mail: sam.wortman@huskers.unl.edu
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Abstract

Knowledge of the soil nitrogen (N) supply and the N mineralization potential of the soil combined with an understanding of weed-crop competition in response to soil nutrient levels may be used to optimize N fertilizer rates to increase the competitive advantage of crop species. A greenhouse study (2006) and field studies (2007 to 2008) in Illinois and Nebraska were conducted to quantify the growth and interference of maize and velvetleaf in response to varying synthetic N fertilizer rates in soils with high and low N mineralization potential. Natural soils were classified as having “low mineralization potential” (LMP), while soils amended with composted manure were classified as having “high mineralization potential” (HMP). Maize and velvetleaf were grown in monoculture or in mixture in both LMP and HMP soils and fertilized with zero, medium, or full locally recommended N rate. In the greenhouse, velvetleaf interference in maize with respect to plant biomass increased as N rate increased in the HMP soil, whereas increasing N rate in the LMP soil reduced velvetleaf interference. In contrast, velvetleaf interference in maize decreased as N rate increased regardless of soil class in the field experiment. With respect to grain yield, velvetleaf interference in maize was unaffected by N rate or soil class. In both greenhouse and field experiments, velvetleaf biomass was greater in the HMP soil class, whereas maize interference in velvetleaf was generally greater in the LMP soil class. While soil N levels influenced weed-crop interference in the greenhouse, the results of the field study demonstrate the difficulty of controlling soil nutrient dynamics in the field and support a maize fertilization strategy independent of weed N use considerations.

Keywords

Velvetleaf, Abutilon theophrasti Medic. ABUTHmaize, Zea mays LIntegrated weed managementamino sugar nitrogencrop-weed interferenceIllinois soil N test
Type
Weed Biology and Ecology
Information
Weed Science , Volume 59 , Issue 2 , June 2011 , pp. 162 - 170
Copyright
Copyright © Weed Science Society of America 

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