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The Effects of Fall Application of Glyphosate on Corn (Zea mays), Soybeans (Glycine max), and Johnsongrass (Sorghum halepense)

Published online by Cambridge University Press:  12 June 2017

L. S. Jeffery ,
J. R. English  and
John Connell
L. S. Jeffery
Affiliation:
Dep. Plant and Soil Sci., Univ. of Tennessee, Knoxville, TN 37916
J. R. English
Affiliation:
Presently with Agric. Stabilization and Conservation Committee (ASCC), Brownsville, TN 38012
John Connell
Affiliation:
Univ. of Tennessee at Ames Plantation, presently Stn. Supt., Stauffer Chemical Co., Leland, MS 38756
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Abstract

Glyphosate [N-(phosphonomethyl)glycine] was applied at various stages of maturity to corn (Zea mays L. ‘Pioneer brand 3147’ and ‘Dekalb XL 394’), soybeans [Glycine max (L.) Merr. ‘Forrest’ and ‘Essex’], and johnsongrass [Sorghum halepense (L.) Pers.]. Glyphosate applied over-the-top of corn before the grain moisture level decreased to 30% (black layer will have been formed) caused various seed and subsequent progeny abnormalities. Depending on grain moisture level at the time of glyphosate application, seed weight was sometimes reduced and progeny seedling emergence, vigor, and weight were reduced. Also, abnormal seedlings, albino or straited, occurred. Glyphosate applied 2½ weeks or more before soybean maturity reduced seed weight, caused seed discoloration, and drastically reduced progeny seedling emergence, vigor, and weight. Glyphosate applied in September or early October controlled semimature johnsongrass. Later applications were less effective because of advanced senescence.

Keywords

Progeny abnormalitiesalbinismblack layer
Type
Research Article
Information
Weed Science , Volume 29 , Issue 2 , March 1981 , pp. 190 - 195
Copyright
Copyright © Weed Science Society of America 

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References

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