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Initial Weed Densities Affect No-Tillage Weed Management with a Rye (Secale cereale) Cover Crop

Published online by Cambridge University Press:  12 June 2017

Inga A. Zasada ,
H. Michael Linker  and
Harold D. Coble
Inga A. Zasada
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
H. Michael Linker
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
Harold D. Coble
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
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Abstract

The objective of this research was to evaluate the influence of different initial weed densities on weed control effectiveness in no-tillage corn at two locations in North Carolina during 1994 and 1995. Different weed densities were established over a 4-year period (1989–1992) by using various weed management strategies. Resultant density levels were estimated and used to establish high and low weed density plots. Treatments applied were PRE, POST, at-planting, and an untreated control. Weed density estimates were made 37 and 57 DAP. Common lambsquarters at low densities (20 to 40 weeds/m2) was controlled with the cover crop alone, but common lambsquarters at high densities (150 to 170 weeds/m2) and redroot pigweed at any density were not controlled. POST herbicides reduced weed densities as well as the PRE herbicides, regardless of initial weed densities.

Keywords

Common lambsquarters, Chenopodium album L. # CHEALredroot pigweed, Amaranthus rebroflexus L. # AMAREcorn, Zea mays L. ‘Pioneer 3634' rye, Secale cereale L. ‘Abruzzi.Allelopathyconservation tillageno-tillagethresholdsDAP, days after plantingPOST, postemergencePRE, preemergence
Type
Research
Information
Weed Technology , Volume 11 , Issue 3 , September 1997 , pp. 473 - 477
Copyright
Copyright © 1997 by the Weed Science Society of America 

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References

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