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Eight Years of Herbicide and Nitrogen Fertilizer Treatments on Kentucky Bluegrass (Poa pratensis) Turf

Published online by Cambridge University Press:  12 June 2017

J. Jack Murray ,
Dayton L. Klingman ,
Ralph G. Nash  and
Edwin A. Woolson
J. Jack Murray
Affiliation:
Beltsville Agric. Res. Ctr., Agric. Res. Serv., U.S. Dep. Agric., Beltsville, MD 20705
Dayton L. Klingman
Affiliation:
Beltsville Agric. Res. Ctr., Agric. Res. Serv., U.S. Dep. Agric., Beltsville, MD 20705
Ralph G. Nash
Affiliation:
Beltsville Agric. Res. Ctr., Agric. Res. Serv., U.S. Dep. Agric., Beltsville, MD 20705
Edwin A. Woolson
Affiliation:
Beltsville Agric. Res. Ctr., Agric. Res. Serv., U.S. Dep. Agric., Beltsville, MD 20705
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Abstract

Annual applications of three nitrogen (N) rates, two broadleaf herbicides, and six annual-grass herbicides in Kentucky bluegrass (Poa pratensis L.) turf were made from 1974 to 1981. With each increment increase in N (2, 4, and 6 kg N/200 m2), the percentage cover of crabgrass (Digitaria spp.) and number of common dandelion (Taraxacum officinale Weber # TAROF) plants were reduced when compared with the next lower rate. There was an interaction between crabgrass control by the annual-grass herbicides and fertilizer rates. When highly effective herbicides were used, there were no differences in crabgrass control related to N rate. When less effective herbicides or no annual-grass herbicides were used, there were great changes directly related to N rate. Each increment of increased N rate increased the turf quality rating. The broadleaf herbicides resulted in differential quality ratings, although differences were relatively small. Highest quality ratings were for plots treated with the three most effective annual-grass herbicides. Residues in the ppb range of some herbicides were detected in soils sampled about a year after the eighth annual herbicide treatments, but residues were below the phytotoxic level and therefore would have had no effect on control of weeds.

Keywords

Digitaria spp.Taraxacum officinaleturf qualityherbicide residuesTAROF
Type
Research Article
Information
Weed Science , Volume 31 , Issue 6 , November 1983 , pp. 825 - 831
Copyright
Copyright © 1983 Weed Science Society of America 

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References

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