Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 November 1977
Published in Agron J 69:1015-1018 (1977)
© 1977 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Effects of Preharvest Desiccation with Glyphosate on Grain Sorghum Seed1

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

The preharvest application of chemical desiccants to reduce moisture content of grain sorghum (Sorghum bicolor (L.) Moench) may make it possible to eliminate costly mechanical drying of harvested grain. The objective of these experiments was to evaluate the effect of glyphosate on the viability of seed from field-treated plants. Seed from grain sorghum plants desiccated with 1.12, 2.24 and 4.48 kg/ha glyphosate [(N-phosphonomethyl) glycine] produced a high percentage of abnormal seedlings with varying amounts of interveinal areas completely devoid of chlorophyll. Mildly affected seedlings recovered from the symptoms and produced normal plants with normally appearing, viable seed. Severely varlegated plants died. Seed damage was greatest when treatments were applied 25 days after flowering when the grain had a moisture content of 30 to 40%. Damage decreased as time of treatment after flowering (30, 35, and 40 days) increased. The number of abnormal seedlings observed in standard germination tests corresponded to the number of variegated seedlings observed in growth evaluation studies. Similar effects were noted for genotypes ‘Top Hand’, BT– 399, and RT– 2536. The last two genotypes are similar to the female and male parents of Top Hand. Rate and time of treatment had no effect on yield of Top Hand.

Key Words: Roundup • Chlorophyll • Germination • Seddlings

1 Cooperative investigation of the ARS-USDA, and the Texas Agric. Exp. Stn., College Station, TX 77843.

2 Plant Physiologist and Agronomist, respectively, ARS-USDA, Dep. of Range Science, Texas A&M Univ., College Station.

3 Assistant professor, Dep. of Soil and Crop Science, Texas A&M Univ., College Station.

Received for publication September 11, 1976.




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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 © 1977 by the American Society of Agronomy.