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Influence of Yellow Nutsedge Competition on Furrow-Irrigated Cotton

Published online by Cambridge University Press:  12 June 2017

P. E. Keeley  and
R. J. Thullen
P. E. Keeley
Affiliation:
Agr. Res. Serv., U.S. Dep. of Agr., Shafter, CA 93263
R. J. Thullen
Affiliation:
Agr. Res. Serv., U.S. Dep. of Agr., Shafter, CA 93263
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Abstract

In five field experiments conducted during 1972 and 1973, yellow nutsedge (Cyperus esculentus L.) was either undisturbed or removed from planting beds by hoeing 0, 2, 4, 6, and 8 weeks after cotton (Gossypium hirsutum L. ‘Acala SJ-1’) emergence. Yellow nutsedge undisturbed in beds increased from 23 plants/m of row at cotton emergence to 100 plants/m at harvest. Nutsedge competing with cotton for more than 4 weeks reduced yield of seed cotton. Nutsedge that competed all season reduced yields 34%, as compared with 20% when it competed for 6 and 8 weeks. Nutsedge that competed with cotton for more than 4 weeks reduced height and number of cotton plants and delayed maturity. Although nutsedge competition reduced yields and delayed maturity, it generally did not alter fiber properties. When nutsedge was removed at cotton emergence and was followed by 14 weekly hoeings, the final tuber population was reduced to 24% of the beginning population. When nutsedge removal was delayed for 6 weeks and was followed by nine weekly hoeings, a fourfold increase in tubers resulted. A further tenfold increase resulted when nutsedge was not removed.

Type
Research Article
Information
Weed Science , Volume 23 , Issue 3 , May 1975 , pp. 171 - 175
Copyright
Copyright © 1975 by the Weed Science Society of America 

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References

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