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Modeling purple nutsedge sprouting under soil solarization

Published online by Cambridge University Press:  20 January 2017

Joel E. Miles ,
Osamu Kawabata  and
Roy K. Nishimoto
Joel E. Miles
Affiliation:
Department of Horticulture, University of Hawaii, Honolulu, HI 96822
Osamu Kawabata
Affiliation:
Department of Plant and Environmental Protection Sciences, University of Hawaii, Honolulu, HI 96822
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Abstract

Sprouting percentage was estimated for purple nutsedge tubers in the field from daily fluctuating soil temperatures. Tuber sprouting under alternating temperatures ranging from 20 to 45 C for 14 d responded quadratically to alternations of high and low temperature. A response surface regression of the cumulative sprouting percentage accounted for 88% of the variation. The cumulative sprouting percentage curves were sigmoidal, and the Richards function satisfactorily regressed the characteristics of the curves. A simulation model was developed for the cumulative sprouting percentage by estimating sprouting from daily high and low temperatures and accumulating daily increments of tuber sprouting. Five weeks of soil solarization with clear polyethylene film at Waimanalo, Hawaii raised the mean soil temperature at 15-cm depth by 5.8 C in spring and by 7.2 C in summer. Solarization also increased the mean daily temperature difference from 1.5 to 3.7 C in spring and from 2.3 to 3.8 C in summer. Solarization increased the final sprouting percentage in the field from 74 to 97% in spring and from 97 to 100% in summer. The simulation model estimated the final field sprouting of tubers within 95% confidence intervals of the observed means.

Keywords

Purple nutsedge, Cyperus rotundus L. CYPROAlternating temperatureRichards functionresponse surface regressionsimulationtuber

Information

Type
Research Article
Information
Weed Science , Volume 50 , Issue 1 , February 2002 , pp. 64 - 71
Copyright
Copyright © Weed Science Society of America 

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