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Competition of Late-Emerging Weeds with Sugarbeets

Published online by Cambridge University Press:  12 June 2017

J.H. Dawson
J.H. Dawson*
Affiliation:
U.S. Dep. Agric, Irrigated Agric. Res. and Ext. Center, Prosser, WA 99350
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Abstract

Weed-free sugarbeets [Beta vulgaris (L.) Beauv.] growing at a spacing of 60 cm (1/2 stand) yielded the same weight of roots as those spaced 30 cm (full stand), and those spaced 90 cm (1/3 stand) yielded about 90% as much. Gross sucrose yield was reduced somewhat more, because the larger roots growing in partial stands contained a lower percentage of sucrose than the roots in full stands. Annual weeds that emerged after July 1 were suppressed and. killed by competition from sugarbeets of normal vigor in a full stand, but became competitive when the sugarbeets were spaced at 1/2 or 1/3 of a full stand. Competition from barnyardgrass [Echinochloa crus-galli (L.) Beauv.] and pigweed (mixture of Amaranthus retroflexus L. and A. powellii S. Wats.), which reached a height of 150 cm, reduced root yields 5 to 39% in 1/2 stands and 19 to 49% in 1/3 stands, as compared with weed-free sugarbeets in the same stands. Hairy nightshade (Solarium sarachoides Sendt.) was abundant but never became taller than the sugarbeets. Its competition had no measurable effect on the sugarbeets.

Type
Research Article
Information
Weed Science , Volume 25 , Issue 2 , March 1977 , pp. 168 - 170
Copyright
Copyright © 1977 by the Weed Science Society of America 

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References

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