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The Critical Period for Weed Control in Corn in Turkey

Published online by Cambridge University Press:  20 January 2017

Dogan Isik ,
Husrev Mennan ,
Bekir Bukun ,
Ahmet Oz  and
Mathieu Ngouajio
Dogan Isik
Affiliation:
Black Sea Agricultural Research Institute, Samsun, Turkey
Husrev Mennan
Affiliation:
Department of Plant Protection, Faculty of Agriculture, Ondokuz Mayıs University, Samsun, Turkey
Bekir Bukun
Affiliation:
Department of Plant Protection, Faculty of Agriculture, Harran University, Şanlıurfa, Turkey
Ahmet Oz
Affiliation:
Black Sea Agricultural Research Institute, Samsun, Turkey
Mathieu Ngouajio*
Affiliation:
Department of Horticulture, Michigan State University, East Lansing, MI 48824
*
Corresponding author's E-mail: [email protected]
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Abstract

Field studies were conducted in 2001 and 2002 in the Black Sea Region of northern Turkey to determine the critical period for weed control (CPWC) in corn and the effects of weed interference on corn height. Treatments of increasing duration of weed interference and weed-free period were imposed at weekly intervals from 0 to 12 wk after crop emergence (WAE). The CPWC was determined with the use of 2.5, 5, and 10% acceptable yield loss levels by fitting logistic and Gompertz equations to relative yield data. With 5% yield loss level, the CPWC was 5 wk, starting at 0.2 WAE and ending at 5.2 WAE, which corresponded to the one- to five-leaf stage of corn. The CPWC increased to 8.9 wk, starting at 0 WAE and ending at 8.9 WAE, at the 2.5% yield loss level. At 10% yield loss level, the CPWC decreased to 1.7 wk, starting at 2.1 WAE and ending at 3.8 WAE.

Keywords

Corn, Zea mays L.Maizeweed competitionweed interferenceAYL, acceptable yield loss levelCLS, corn leaf stageCPWC, critical period for weed controlDAE, days after emergenceWAE, weeks after emergence
Type
Research
Information
Weed Technology , Volume 20 , Issue 4 , December 2006 , pp. 867 - 872
Copyright
Copyright © Weed Science Society of America 

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