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Dynamics of Sulfentrazone Applied to Sugarcane Crop Residues

Published online by Cambridge University Press:  20 January 2017

Caio A. Carbonari ,
Giovanna L. G. C. Gomes ,
Maria L. B. Trindade ,
José R. M. Silva  and
Edivaldo D. Velini
Caio A. Carbonari*
Affiliation:
Department of Crop Science, São Paulo State University (Universidade Estadual Paulista “Júlio de Mesquita Filho” UNESP), College of Agricultural Sciences, Botucatu/SP, Brazil
Giovanna L. G. C. Gomes
Affiliation:
Department of Crop Science, São Paulo State University (Universidade Estadual Paulista “Júlio de Mesquita Filho” UNESP), College of Agricultural Sciences, Botucatu/SP, Brazil
Maria L. B. Trindade
Affiliation:
Bioativa Pesquisa e Compostos Bioativos, Botucatu/SP, Brazil
José R. M. Silva
Affiliation:
Department of Crop Science, São Paulo State University (Universidade Estadual Paulista “Júlio de Mesquita Filho” UNESP), College of Agricultural Sciences, Botucatu/SP, Brazil
Edivaldo D. Velini
Affiliation:
Department of Crop Science, São Paulo State University (Universidade Estadual Paulista “Júlio de Mesquita Filho” UNESP), College of Agricultural Sciences, Botucatu/SP, Brazil
*
Corresponding author's E-mail: carbonari@fca.unesp.br
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Abstract

The sulfentrazone is regularly applied to sugarcane crop harvest residue for PRE control of weedy species, especially in the dry season during the year, but little is known about how rainfall timing or crop residue mass affect the release of sulfentrazone into the soil and its subsequent effectiveness. Two experiments were conducted to examine the effects of sugarcane residue mass (5, 10, 15, and 20 t ha−1) and rainfall timing (1, 30, and 60 d after herbicide application) on sulfentrazone retention. Rainfall volumes were simulated at 2.5, 5, 10, 20, 35, 50, and 100 mm. A 20-mm rainfall volume was simulated at 7 and 14 d after the first simulated event. The water passing through the straw was collected after each rainfall simulation. The concentration of sulfentrazone was measured by liquid chromatography and mass spectrometry. The initial 20 mm of rain released the maximum mass of sulfentrazone from the sugarcane residue. The mass of sugarcane residue affected the amount of sulfentrazone recovered. The amount of sulfentrazone released from the residue was significantly reduced by the persistence on the residue surface for long periods before the occurrence of rain. During periods of low rainfall, recommendations for sulfentrazone rate must take into account losses that occur when applied over the harvest residues to design a weed-management plan that does not compromise efficacy and duration of the residual effects.

Keywords

SulfentrazonesugarcaneSaccharum interspecific hybridsherbicidemulchraw sugarcanesorption
Type
Soil/Air/Water
Information
Weed Science , Volume 64 , Issue 1 , March 2016 , pp. 201 - 206
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Associate Editor for this paper: John L. Lindquist, University of Nebraska

References

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