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Weed-Crop Responses to Weed Management Systems in Conservation Tillage Corn (Zea mays)

Published online by Cambridge University Press:  12 June 2017

C. Benjamin Coffman  and
J. Ray Frank
C. Benjamin Coffman
Affiliation:
USDA, ARS, Beltsville, MD 20705
J. Ray Frank
Affiliation:
USDA, ARS, Frederick, MD 21702
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Abstract

Continuous corn was grown for 5 consecutive yr using conservation tillage methods in the Maryland Piedmont. Herbicide treatments were applied annually at common usage rates and were compared for their effects on weed cover, species stability, and grain production. Weed flora dominance shifted from giant foxtail the first year to smooth pigweed the following year. Smooth pigweed then dominated the flora for the duration of the study. Horsenettle was ubiquitous in all treatments but never became competitive. Canada thistle occurred in measurable densities in all plots that had not received atrazine applied preemergence. Grain yields were correlated negatively with densities of smooth pigweed in 1983 (r = −0.58, P = 0.01), and Canada thistle in 1983 and 1984 (r = −0.63 and −0.62, respectively; P = 0.05). Grain yields were correlated positively with midseason precipitation (r = 0.85, P = 0.01).

Keywords

Atrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diaminecorn, Zea mays L.giant foxtail, Setaria faberi Herrm. ♯ SETFAsmooth pigweed, Amaranthus hybridus L. ♯ AMACHhorsenettle, Solanum carolinense L. ♯ SOLCACanada thistle, Cirsium arvense (L.) Scop. ♯ CIRARWeed-crop ecologyweed shiftsestablished weedsperennial weedscompetitiongrain yield
Type
Research
Information
Weed Technology , Volume 5 , Issue 1 , March 1991 , pp. 76 - 81
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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