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Banded herbicide, rotary hoeing and cultivation effects on weed populations in ridge-tilled soybean

Published online by Cambridge University Press:  12 February 2007

Thomas W. Jurik
Thomas W. Jurik*
Affiliation:
Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, IA 50011, USA,.
*
*Corresponding author: Email: jurik@iastate.edu
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Abstract

Can banded herbicide be eliminated in ridge-tilled soybean (Glycine max)? The effects of banded herbicide, rotary hoeing and cultivation on weed populations and soybean yield in a ridge-tillage system were tested on three farms in Iowa, USA in 1989 and 1990. In 1989, plots either had no herbicide or had herbicide banded in the row at planting in mid-May; all plots received two rotary hoeings and two cultivations. In 1990, treatments were banded herbicide with no rotary hoeing, banded herbicide with one rotary hoeing, and no herbicide with one or two rotary hoeings; all plots received two or three cultivations. In both years, over all weed species [primarily giant foxtail (Setaria faberi), Pennsylvania smartweed (Polygonum pensylvanicum) and redroot pigweed (Amaranthus retroflexus)], seedling emergence was highest in late May and early June, with few seedlings emerging after mid-June. Weed populations were highest in May and June, after which rotary hoeing and cultivation reduced weed numbers in all plots. There were no consistent differences among treatments in weed numbers in early August for the 2 years. In both years, there was no significant difference in soybean yield among treatments. Within-farm mean yields ranged from 2.26 to 3.01 Mg ha−1 among farms in 1989 and from 2.07 to 2.93 Mg ha−1 among farms in 1990. Ridge-tillage without herbicide was generally equivalent to ridge-tillage with banded herbicide, with respect to total number of weeds and number of broad-leaved weeds remaining in August after tillage, and to soybean yield.

Keywords

conservation tillagemechanical weed controlseedling emergenceweed densityweed population dynamics
Type
Review Article
Information
Renewable Agriculture and Food Systems , Volume 21 , Issue 3 , September 2006 , pp. 151 - 158
Copyright
Copyright © Cambridge University Press 2006

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