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Effect of Diluent Volume and Calcium on Glyphosate Phytotoxicity

Published online by Cambridge University Press:  12 June 2017

C. L. Sandberg ,
W. F. Meggitt  and
Donald Penner
C. L. Sandberg
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48824
W. F. Meggitt
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48824
Donald Penner
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48824
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Abstract

The effects of diluent volume and calcium concentration on glyphosate [N-(phosphonomethyl] glycine] phytotoxicity were evaluated by adding 0.0, 0.0025, 0.005, 0.01, 0.02, and 0.04 M CaCl2 to 1.68 kg/ha glyphosate and applying at 130, 190, 375, and 750 L/ha to tall morningglory [Ipomoea purpurea (L.) Roth] plants that were 10 to 12 cm tall. Thirty days after treatment, glyphosate phytotoxicity was reduced by calcium at diluent volumes of 375 and 750 L/ha. Addition of a sulfonine red dye to the spray solution showed that at 130 L/ha, runoff from tall morningglory leaves was negligible. At 375 and 750 L/ha different volumes, ½ to ¾ of the spray solution, as measured by dye retention, ran off the leaf surface. At 750 L/ha, the water and dye collected at the leaf margins and the spray pattern on the leaf surface was not uniform.

Keywords

Tall morninggloryIpomoea purpureaspray composition
Type
Research Article
Information
Weed Science , Volume 26 , Issue 5 , September 1978 , pp. 476 - 479
Copyright
Copyright © 1978 by the Weed Science Society of America 

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References

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