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Effect of nitrogen fertilizer and landscape position on wild oat (Avena fatua) interference in spring wheat

Published online by Cambridge University Press:  20 January 2017

Delaney M. Ross  and
Rene C. Van Acker
Delaney M. Ross
Affiliation:
Department of Plant Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
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Abstract

Site-specific fertilizer application is of primary interest among those investigating site-specific crop management. Site-specific soil moisture levels may be associated with the relative success of certain weed species, and weed competition can be affected by fertilizer application. A field study was conducted to investigate how landscape position–based site-specific nitrogen fertilizer application would influence wild oat interference in spring wheat. Wild oat was allowed to grow in spring wheat at foot and knoll landscape positions in the presence or absence of 80 to 90 kg ha−1 of spring preseed broadcast nitrogen fertilizer. In all three site–years of the study, landscape position did not affect wild oat competitiveness in wheat or relative wild oat biomass, and there were no significant landscape position by nitrogen fertilizer interactions for these variables. The lack of landscape position effect may be attributed to the lack of substantive differences in soil characteristics between landscape positions at the sites used in this study and to normal to above-average seasonal precipitation levels in all three site–years. Wild oat competitiveness in wheat was significantly greater in the presence of nitrogen fertilizer for all three site–years. The results of this study suggest that, when there are not great differences in typical soil characteristics between landscape positions and precipitation levels are normal or above normal, landscape-based site-specific nitrogen fertilizer application does not affect wild oat competitiveness in spring wheat, but preseed spring broadcast nitrogen fertilizer does make wild oat more competitive in spring wheat.

Keywords

Wild oat, Avena fatua L. AVEFAwheat, Triticum aestivum L. TRZASSite-specific nitrogen applicationsite-specific farminginterference
Type
Weed Management
Information
Weed Science , Volume 53 , Issue 6 , December 2005 , pp. 869 - 876
Copyright
Copyright © Weed Science Society of America 

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