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Effect of pH on Metribuzin Activity in the Soil

Published online by Cambridge University Press:  12 June 2017

James S. Ladlie
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., E. Lansing, MI 48824
William F. Meggitt
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., E. Lansing, MI 48824
Donald Penner
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., E. Lansing, MI 48824

Abstract

Metribuzin [4-amino-6-tert-butyl-3-(methylthio)-as-triazine-5(4H)one] applied preemergence resulted in increased phytotoxicity with increasing soil pH. In the field, fall panicum (Panicum dichotomiflorum Michx.) control, number of dead corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] plants, and crop injury ratings increased, and plant height and grain yield decreased as the soil pH increased. In the greenhouse, corn and soybean grown in soil showed decreased dry weights due to metribuzin as pH increased. By contrast, the pH response to metribuzin was not evident in nutrient-sand culture, indicating that, in soil, pH affected the availability of metribuzin for plant absorption.

Type
Research Article
Copyright
Copyright © 1976 by the Weed Science Society of America 

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References

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