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Interrelations of Tillage and Weed Control for Soybean (Glycine max) Production

Published online by Cambridge University Press:  12 June 2017

Charles L. Webber III ,
Harold D. Kerr  and
Maurice R. Gebhardt
Charles L. Webber III
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Crop Prod. Res. Unit, Agric. Eng. Bldg., Univ. Missouri, Columbia, MO 65211
Harold D. Kerr
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Crop Prod. Res. Unit, Agric. Eng. Bldg., Univ. Missouri, Columbia, MO 65211
Maurice R. Gebhardt
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Crop Prod. Res. Unit, Agric Eng. Bldg., Univ. Missouri, Columbia, MO 65211
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Abstract

A 3-yr (1982, 1983, and 1984) study was conducted to determine the relationship between tillage and six weed control treatments for soybean [Glycine max (L.) Merr. ‘Williams 79′] production on silt loam (Udollic and Mollic Ochraqualfs). Conventional tillage consisted of spring moldboard plowing and secondary tillage with a combination tool just before planting. No-tillage consisted of a foliar application of glyphosate [N-(phosphonomethyl)glycine] at the time of planting. Weed control treatments included combinations of no weed control with and without soybean plants, preemergence herbicide application only, postemergence herbicide application only, and combined preemergence and postemergence applications with and without additional handweeding. In 1982, a year of above-normal seasonal rainfall, conventional tillage had significantly greater soybean grain yields than no-tillage for all weed control treatments except the preemergence-only treatment. Yields within tillage systems and between weed control treatments in 1982 were not significantly different because adequate rainfall reduced the effect of weed competition for soil moisture. Soybean seed yields in 1983 and 1984 in no-tillage were equal to or significantly greater than those of conventional tillage. No-tillage treatments had greater soil moisture conservation and soil moisture availability resulting in less plant water stress during podfilling in periods of drought in 1983 and 1984. In all 3 yr, conventional tillage had significantly greater early weed growth than no-tillage in the treatments with and without soybean plants where no preemergence or postemergence herbicides were used. Comparing treatments with and without soybean plants indicated an average increase of 36 and 38% weed control for no-tillage and conventional tillage, respectively.

Keywords

No-tillagecompetitioninterferenceconservation tillageherbicidesGlycine max
Type
Weed Control and Herbicide Technolgy
Information
Weed Science , Volume 35 , Issue 6 , November 1987 , pp. 830 - 836
Copyright
Copyright © 1987 by the Weed Science Society of America 

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