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Dry Pea (Pisum sativum L.) Response to Low Rates of Selected Foliar- and Soil-Applied Sulfonylurea and Growth Regulator Herbicides

Published online by Cambridge University Press:  12 June 2017

Kassim Al-Khatib*
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Ajit Tamhane
Affiliation:
Department of Statistics, Northwestern University, Evanston, IL 60208
*
Corresponding author's E-mail: [email protected].

Abstract

Field experiments on dry pea (Pisum sativum) were conducted at five locations across the United States in 1995 and 1996 to investigate the effects of low rates of chlorsulfuron, thifensulfuron, and dicamba applied postemergence and of chlorsulfuron, metsulfuron, and clopyralid applied preplant incorporated in the soil on pea plants. Although chlorsulfuron, thifensulfuron, and dicamba caused significant injury symptoms on pea plants, they had little effect on yield. The lowest rates of foliar applications that caused observable symptoms were 0.035, 0.086, and 1.56 g ai/ha for chlorsulfuron, thifensulfuron, and dicamba, respectively, whereas chlorsulfuron, thifensulfuron, and dicamba rates that reduced pea yield by 25% were 0.18, 1.36, and 25 g/ha, respectively. Clopyralid caused more injury symptoms than metsulfuron or chlorsulfuron with soil application. However, the lowest rates of chlorsulfuron, metsulfuron, and clopyralid that caused observable symptoms were lower than the rates that reduced yield. This study showed that pea plants can sustain some level of plant injury without a large reduction in yield.

Type
Research
Copyright
Copyright © 1999 by the Weed Science Society of America 

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Footnotes

1

Contribution 99-128J from the Kansas Agricultural Experiment Station.

References

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