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Johnsongrass (Sorghum halepense) Control as Influenced by Timing of Asulam and Fertilizer/Cultivation Applications

Published online by Cambridge University Press:  12 June 2017

Stacey A. Bruff ,
James L. Griffin  and
Edward P. Richard Jr.
Stacey A. Bruff
Affiliation:
Dep. Plant Pathol. and Crop Physiol., 302 Life Sci. Bldg., Baton Rouge, LA 70803
James L. Griffin
Affiliation:
Dep. Plant Pathol. and Crop Physiol., 302 Life Sci. Bldg., Baton Rouge, LA 70803
Edward P. Richard Jr.
Affiliation:
Sugarcane Res. Unit. Agric. Res. Serv., U.S. Dep. Agric., P.O. Box 470. Houma. LA 70361
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Abstract

Field studies were conducted over 3 yr to evaluate rhizome johnsongrass control with asulam applied POST at 3.7 kg ai/ha 3 d before fertilization (DBF) or 0, 3, 7, 10, or 14 d after fertilization (DAF). Liquid fertilizer (18-6-12) was applied with injector knives at 0, 112, or 224 kg N/ha 5 cm on each side of a 60-cm line of rhizome johnsongrass present on 1.8-m-wide conventional sugarcane beds. Johnsongrass response to timing of asulam application after fertilization varied among years but was not affected by fertilizer rate. Johnsongrass control with asulam applied 3 DBF was greater than applications made 0, 3, or 7 DAF. With one exception, differences in johnsongrass control following fertilization and asulam application times were also reflected in the biomass of treated johnsongrass and its regrowth harvested 6 and 10 wk after asulam application, respectively. Reduced johnsongrass control associated with asulam application following fertilization was related to stress from root/rhizome injury during fertilizer placement rather than the quantity of fertilizer applied.

Keywords

Asulam, methyl [(4-amino-phenyl)sulfonyl]carbamatejohnsongrass. Sorghum halepense (L.) Pers. #3 SORHAsugarcane, a complex hybrid of Saccharum spp.Herbicide stressroot pruningsugarcaneSaccharum spp.SACOFSORHA
Type
Research
Information
Weed Technology , Volume 10 , Issue 1 , March 1996 , pp. 134 - 139
Copyright
Copyright © 1996 by the Weed Science Society of America 

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