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Effects of Tillage on Trifluralin Residue Carryover Injury to Corn (Zea mays)

Published online by Cambridge University Press:  12 June 2017

Robert G. Hartzler ,
Richard S. Fawcett  and
Michael D. K. Owen
Robert G. Hartzler
Affiliation:
Dep. Agron., Iowa State Univ., Ames, IA 50011
Richard S. Fawcett
Affiliation:
Dep. Agron., Iowa State Univ., Ames, IA 50011
Michael D. K. Owen
Affiliation:
Dep. Agron., Iowa State Univ., Ames, IA 50011
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Abstract

Trifluralin was evaluated at 1.1, 2.2, and 4.5 kg/ha in 1983 and 1984 at two locations in Iowa for residue carryover injury to corn the following seasons. Three methods of seedbed preparation (no-till, moldboard, and chisel plowing) for corn planting were also examined. There was no effect on corn growth at the 1.1 kg/ha rate of trifluralin. Averaged over the four experiments, reductions in corn height of 8 and 24% were observed 5 weeks after planting at 2.2 and 4.5 kg/ha, respectively. The relative degree of stunting due to trifluralin decreased as the growing season progressed. Early-season carryover injury was more severe in reduced tillage than in moldboard plow treatments in the 1983-84 Nashua experiment. Moldboard and chisel plowing reduced the concentration of trifluralin in the 0- to 7.5-cm zone of the soil profile by 62 and 31%, respectively, when compared to no-till. No yield reductions were observed at the 1.1 or 2.2 kg/ha rate of trifluralin. In 1984, grain yields were reduced by 8 and 16% at Ames and Nashua, respectively, by the 4.5 kg/ha trifluralin rate.

Keywords

Trifluralin, 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl) benzenaminecorn, Zea mays L.Herbicide degradationno-tillreduced tillage
Type
Soil, Air, and Water
Information
Weed Science , Volume 37 , Issue 4 , July 1989 , pp. 609 - 615
Copyright
Copyright © 1989 by the Weed Science Society of America 

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