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Ammonium Sulfate Enhancement of Glyphosate and SC-0224 Control of Johnsongrass (Sorghum halepense)

Published online by Cambridge University Press:  12 June 2017

Clay D. Salisbury ,
James M. Chandler  and
Morris G. Merkle
Clay D. Salisbury
Affiliation:
Soil and Crop Sci. Dep., Texas A & M Univ., College Station, TX 77843
James M. Chandler
Affiliation:
Soil and Crop Sci. Dep., Texas A & M Univ., College Station, TX 77843
Morris G. Merkle
Affiliation:
Soil and Crop Sci. Dep., Texas A & M Univ., College Station, TX 77843
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Abstract

Ammonium sulfate enhanced the initial control of johnsongrass by glyphosate and SC-0224 applied in the fall or summer. Glyphosate at 0.42 kg ha-1 in combination with ammonium sulfate at 3.33 kg ha-1 provided levels of fall johnsongrass control and spring regrowth control comparable to glyphosate at 0.84 kg ha-1. Spring applications to mixed populations of seedling and rhizome johnsongrass showed that ammonium sulfate added to glyphosate or SC-0224 afforded little enhancement of herbicide efficacy. Glyphosate or SC-0024 at 0.42 kg ha-1 applied in combination with logarithmically decreasing rates of ammonium sulfate demonstrated reduced weed control with ammonium sulfate rates above 9.7 kg ha-1.

Keywords

Glyphosate, N-(phosphonomethyl)glycineSC-0224, trimethylsulfonium carboxymethylaminomethylphosphonatejohnsongrass, Sorghum halepense (L.) Pers. ♯ SORHAammonium sulfateSpray additivelogarithmic application
Type
Research
Information
Weed Technology , Volume 5 , Issue 1 , March 1991 , pp. 18 - 21
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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