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Ivyleaf Morningglory (Ipomoea hederacea) Interference with Cotton (Gossypium hirsutum)

Published online by Cambridge University Press:  12 June 2017

Joy B. Rogers ,
Don S. Murray ,
Laval M. Verhalen  and
P. L. Claypool
Joy B. Rogers
Affiliation:
Dep. Agron., Oklahoma State Univ., Stillwater, OK 74078
Don S. Murray
Affiliation:
Dep. Agron., Oklahoma State Univ., Stillwater, OK 74078
Laval M. Verhalen
Affiliation:
Dep. Agron., Oklahoma State Univ., Stillwater, OK 74078
P. L. Claypool
Affiliation:
pep. Stat., Oklahoma State Univ., Stillwater, OK 74078
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Abstract

Full-season interference and critical duration of early-season ivyleaf morningglory interference with cotton were measured in experiments at two Oklahoma locations. Densities ranging from 0 to 64 weeds/10 m of row were evaluated for their effects on cotton lint yield, fiber quality, and harvest efficiency. Analyses using linear-linear regression proved superior to linear, curvilinear, and linear-plateau models. Lint yield reductions of 36.9 kg/ha (or 5.9%) were recorded at Perkins for each weed/10 m up to 8.7. At densities greater than 8.7/10 m, yield was reduced an additional 3.0 kg/ha (0.5%) for each additional weed. At Chickasha, lint yield was reduced 29.7 kg/ha (or 3.9%) for each weed/10 m up to 9.0 with an additional lint loss of 3.6 kg/ha (0.7%) for each weed above the density of 9.0/10 m. Yield losses were over 80% before fiber length was also reduced. Mechanical harvest was not possible at densities above 8 weeds/10 m at Chickasha and above 16 weeds/10 m at Perkins. In critical duration experiments conducted at Perkins, lint yield was reduced 52.9 kg/ha (or 11.2%) for each week weed removal was delayed up to 9.5 wk. An additional 1.0 kg/ha (0.2%) was lost for each week of interference after 9.5 wk. At Chickasha, lint yield was reduced 49.0 kg/ha (or 7.8%) for each week of interference up to 11.0 wk with an additional loss of 1.2 kg/ha (0.2%) for each week thereafter.

Keywords

Ivyleaf morningglory, Ipomoea hederacea (L.) Jacq. #3 IPOHEcotton, Gossypium hirsutum L., ‘Paymaster 145’ and ‘Paymaster HS-26.'Competitionfiber qualityharvest efficiencylint yieldIPOHE
Type
Research
Information
Weed Technology , Volume 10 , Issue 1 , March 1996 , pp. 107 - 114
Copyright
Copyright © 1996 by the Weed Science Society of America 

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References

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