Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 September 1975
Published in Agron J 67:618-621 (1975)
© 1975 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Preharvest Desiccation of Grain Sorghum with Glyphosate1

R. W. Bovey2, F. R. Miller3 and J. R. Baur2

The need for an effective and nontoxic preharvest desiccant for grain sorghum (Sorghum bicolor (L.) Moench) has been recognized for many years. Studies were conducted to compare glyphosate [(N-phosphonomethyl) glycine] to sodium chlorate and paraquat (1,1'-dimethyl-4,4'-bipyridinium ion) on hybrids RS 626 and Tophand. Glyphosate was more effective than sodium chlorate or paraquat in reducing grain, leaf, and stem moisture content. Glyphosate reduced grain moisture content to 13% or lower within 1 week after treatment from original grain moisture content of 20, 30 or 40%. Glyphosate prevented growth of axillary buds of grain sorghum and killed all established johnsongrass and Coloradograss in treated agreas. Lodging of grain sorghum was insignificant for 3 weeks following glyphosate treatment, despite heavy rainfall and high wind velocity. Germination of treated grain was not affected by glyphosate at rates of 0.56 and 1.12 kg/ha. The low mammalian toxicity and the absence of phytotoxicity from soil residue suggests that glyphosate may be a valuable preharvest grain sorghum desiccant.

Key Words: Herbicide • Germination • Weed control • Grain moisture • Leaf moisture • Stem moisture • Regrowth

1 Cooperative investigations of the USDA-ARS, and the Texas Agric. Exp. Stn., College Station, Tex.

2 Agronomist and plant physiologist, USDA-ARS, Dep. of Range Science, Texas A&M Univ., College Station, TX 77843.

3 Research associate, Dep. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843.

Received for publication July 30, 1973.




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The SCI Journals Crop Science Vadose Zone Journal
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1975 by the American Society of Agronomy.