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Competition Between Annual Weeds and Sweet Spanish Onions

Published online by Cambridge University Press:  12 June 2017

G. A. Wicks ,
D. N. Johnston ,
D. S. Nuland  and
E. J. Kinbacher
G. A. Wicks
Affiliation:
North Platte Sta., North Platte 69101, Univ. of Nebraska
D. N. Johnston
Affiliation:
Union, Pacific Railroad, Omaha 68102, Univ. of Nebraska
D. S. Nuland
Affiliation:
Scottsbluff Sta., Mitchell 69357, Univ. of Nebraska
E. J. Kinbacher
Affiliation:
Dep. of Hort. and Forestry, Lincoln 68503, Univ. of Nebraska
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Abstract

The competitiveness of annual weeds in irrigated sweet Spanish onions (Allium cepa L.) was studied at North Platte, Nebraska, during 1969 and 1970. Weeds allowed to grow in the row for 2, 4, 6, and 8 weeks after onion emergence reduced onion yields 20, 20, 40, and 65%, respectively. When plots were kept weed-free until onion emergence and 2, 4, 6, 8, 10, and 12 weeks after emergence, onion yields were reduced 100, 99, 87, 75, 46, 25, and 5%, respectively. Redroot pigweed (Amaranthus retroflexus L.), kochia (Kochia scoparia L.), and grass weeds accounted for 54, 21, and 21%, respectively, of the total weed yield.

Type
Research Article
Information
Weed Science , Volume 21 , Issue 5 , September 1973 , pp. 436 - 439
Copyright
Copyright © 1973 Weed Science Society of America 

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References

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