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Influence of Hexazinone on ‘Tifton 85’ Bermudagrass Growth and Forage Quality

Published online by Cambridge University Press:  20 January 2017

B. Wilder ,
J.A. Ferrell ,
B.A. Sellers  and
G.E. MacDonald
B. Wilder
Affiliation:
Agronomy Department, University of Florida, Gainesville, FL 32611
J.A. Ferrell*
Affiliation:
Agronomy Department, University of Florida, Gainesville, FL 32611
B.A. Sellers
Affiliation:
Range Cattle Research and Education Center, Ona, FL 33865
G.E. MacDonald
Affiliation:
Agronomy Department, University of Florida, Gainesville, FL 32611
*
Corresponding author's E-mail: [email protected]
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Abstract

Smutgrass is a clump-type grassy weed that is commonly found in grazed pastures throughout the Southeast. Currently, the only herbicide registered for control of smutgrass is hexazinone and it is unknown if hexazinone negatively impacts bermudagrass forage growth and quality. Experiments were conducted to determine the impact of hexazinone rate on bermudagrass yield and crude protein. All rates of hexazinone reduced bermudagrass yield at 4 wk after treatment (WAT). From 6 to 12 WAT, no bermudagrass yield reduction was observed except for the 2 kg/ha treatment. The yield reducing effects of hexazinone were transitory at the 0.5 and 1.0 kg/ha rates; cumulative yield for the season was reduced by 17 and 23%, respectively. Although yield was negatively influenced by hexazinone, crude protein generally increased in a linear fashion with increased hexazinone rate.

Keywords

Hexazinone, bermudagrass, Cynodon dactylon (L.) Pers. × C. transvaalensis Burtt-Davy, ‘Tifton-85’Crude proteinforage yieldinjurynear infrared reflectance spectrometry
Type
Weed Management — Other Crops/Areas
Information
Weed Technology , Volume 22 , Issue 3 , September 2008 , pp. 499 - 501
Copyright
Copyright © Weed Science Society of America 

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