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Rotary Hoeing Substitutes for Two-Thirds Rate of Soil-Applied Herbicide

Published online by Cambridge University Press:  20 January 2017

Frank Forcella
Frank Forcella*
Affiliation:
North Central Soil Conservation Research Laboratory, USDA-ARS, 803 Iowa Avenue, Morris, MN 56267. E-mail: forcella@morris.ars.usda.gov
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Abstract

Dose–response curves for acetochlor with and without timely rotary hoeing (two passes) were derived for corn (Zea mays) fields over 2 yr. The fields were dominated by green foxtail (Setaria viridis), which constituted 73 to 86% of the weed vegetation, but also contained minor populations of common lambsquarters (Chenopodium album), Pennsylvania smartweed (Polygonum pensylvanicum), and redroot pigweed (Amaranthus retroflexus). In the absence of herbicide, rotary hoeing achieved about 50% weed control. In the absence of rotary hoeing, weed control averaged > 90% at the full label rate of acetochlor (3 kg ai/ha on clay loam soil). With two timely rotary hoeings, however, this same level of control was achieved with only 1 kg/ha acetochlor. Given the suite of weed species present in these experiments, timely rotary hoeing substituted for 67% of the label rate of acetochlor. Timeliness of rotary hoeing operations also provided consistency of results from one year to the next.

Keywords

Acetochlor, 2-chloro-N-(ethoxymethyl)-N-(2-ethyl-6-methylphenyl)acetamidecommon lambsquarters, Chenopodium album L. # CHEALgreen foxtail, Setaria viridis (L.) Beauv. # SETVIPennsylvania smartweed, Polygonum pensylvanicum (L.) # POLPYredroot pigweed, Amaranthus retroflexus L.corn, Zea mays L.Integrated weed managementinterrow cultivationpreemergence herbicideseedling emergencetimeliness
Type
Research Article
Information
Weed Technology , Volume 14 , Issue 2 , June 2000 , pp. 298 - 303
Copyright
Copyright © Weed Science Society of America 

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