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1 October 2006 The Critical Period for Weed Control in Corn in Turkey
DOGAN ISIK, HUSREV MENNAN, BEKIR BUKUN, AHMET OZ, MATHIEU NGOUAJIO
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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.

Nomenclature: Corn, Zea mays L.

Additional index words: Maize, weed competition, weed interference.

Abbreviations: AYL, acceptable yield loss level; CLS, corn leaf stage; CPWC, critical period for weed control; DAE, days after emergence; WAE, weeks after emergence.

DOGAN ISIK, HUSREV MENNAN, BEKIR BUKUN, AHMET OZ, and MATHIEU NGOUAJIO "The Critical Period for Weed Control in Corn in Turkey," Weed Technology 20(4), 867-872, (1 October 2006). https://doi.org/10.1614/WT-05-102.1
Published: 1 October 2006
JOURNAL ARTICLE
6 PAGES


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