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Interrow Cultivation to Reduce Herbicide Use in Corn following Alfalfa without Tillage

USDA-ARS Natl. Soil Tilth Lab, 2150 Pammel Dr., Ames, IA 50011

Jerry D. Doll, Richard T. Proost and Mark R. Visocky

Dep. of Agronomy, Univ. of Wisconsin, Madison, WI 53706

^* Corresponding author

Information on integrated weed management systems for conservation tillage systems is needed so that producers can minimize the environmental impacts of crop production without sacrificing profitability. Our objective was to evaluate reduced levels of preemergence herbicides in combination with interrow cultivation for weed control in corn (Zea mays L.) planted into an unfilled, deteriorated alfalfa stand treated with glyphosate [N-(phosphonomethyl)glycine] the previous fall. Fall application of glyphosate controlled 97% of the perennial vegetation without additional treatment the following spring. Atrazine [6-chloro-N-ethyl-N'-(l-methylethyl)-l,3,5-triazine-2,4-diamine] at 1.1 kg a.i. ha^–1 or cyanazine (2-[[4-chloro-6-(ethylamino)- l,3,5-triazin-2-yl]amino]-2-methylpropanenitrile) at 2.2 kg a.i. ha^–1 applied within 1 d after corn planting greatly reduced weed densities

Received for publication February 8, 1993.

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