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Competition of Forage Species with Canada Thistle, as Affected by Irrigation and Nitrogen Levels

Published online by Cambridge University Press:  12 June 2017

Frank P. Thrasher ,
Clee S. Cooper  and
Jesse M. Hodgson
Frank P. Thrasher
Affiliation:
Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture
Clee S. Cooper
Affiliation:
Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture
Jesse M. Hodgson
Affiliation:
Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture
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Abstract

Of the grasses studied over a 3-year period, Alta tall fescue (Festuca arundinacea) was most competitive and Troy bluegrass (Poa pratensis L.) least competitive with Canada thistle (Cirsium arvense). Ladino white clover was more competitive than birdsfoot trefoil (Lotus corniculatus) when present in full stands. Winter-killing of Ladino clover (Trifolium repens L.) resulted in an increase in Canada thistle, particularly at low irrigation levels. Irrigation favored an increase in Canada thistle numbers in the year the grass stands were established. In the next two years thistle numbers declined more rapidly on irrigated than on non-irrigated plots. High rates of nitrogen increased the competitive ability of the grasses.

Type
Research Article
Information
Weeds , Volume 11 , Issue 2 , April 1963 , pp. 136 - 138
Copyright
Copyright © 1963 Weed Science Society of America 

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References

Literature Cited

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