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Published online 1 July 1965
Published in Agron J 57:385-389 (1965)
© 1965 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Effectiveness of Preplanting Tillage in Relation to Herbicides in Controlling Johnsongrass for Soybean Production1

C. G. McWhorter and E. E. Hartwig2

Synopsis: Adequate control of established johnsongrass in soybeans was obtained by use of summer-fallow cultivation or intensive preplanting tillage. Soybeans planted following 6 to 10 diskings yielded more than soybeans grown in the conventional manner and as much as soybeans grown in plots where johnsongrass was controlled with herbicides. Disking appeared to provide more control than chemicals applied as recommended. The effectiveness of frequent disking in johnsongrass control appeared to be directly related to rhizome dehydration.

1 Contribution from the Crops Research Division, ARS, USDA, in cooperation with the Delta Branch of the Mississippi Agricultural Experiment Station, Stoneville. Journal Series No. 1107, Mississippi Agr. Exp. Sta.

2 Research Plant Physiologist and Research Agronomist, Stoneville, Mississippi.

Received for publication December 2, 1963.




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Copyright © 1965 by the American Society of Agronomy.