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Effects of Soil Moisture on Observed and Predicted Yellow Nutsedge (Cyperus esculentus L.) Emergence

Published online by Cambridge University Press:  12 June 2017

Cheryl A. Wilen ,
Jodie S. Holt  and
William B. McCloskey
Cheryl A. Wilen
Affiliation:
Dep. Botany and Plant Sciences, Univ. Calif., Riverside, CA 92521
Jodie S. Holt
Affiliation:
Dep. Botany and Plant Sciences, Univ. Calif., Riverside, CA 92521
William B. McCloskey
Affiliation:
Dep. Plant Sciences, Univ. Ariz., Tucson, AZ 85721
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Abstract

Experiments were conducted to examine the effects of low soil moisture on yellow nutsedge emergence in relation to thermal and chronological time and test the ability of thermal models generated previously to predict emergence under water stress. Unsprouted tubers from California and Arizona were planted in pots, buried at field sites in California and Arizona, and subjected to wet or dry treatments. Pots were monitored weekly to determine date of emergence and number of emerged shoots. The California genotype emerged 47 to 61 days after planting (DAP) in the dry treatment and 33 to 49 DAP in the wet treatment, depending on planting site. The range for the Arizona genotype was 51 to 76 DAP in the dry treatment and 43 to 61 DAP in the wet treatment. Days and degree-day intervals to first emergence differed between irrigation treatments and planting sites but interactions were not significant. All models were accurate in predicting emergence dates for genotypes in the wet treatment at the California site, while emergence in Arizona was underestimated by 9 d. Tubers subjected to the dry treatment needed a higher number of accumulated degree-day units before emergence occurred and had fewer emerged shoots as compared to the wet treatment. Degree-day models generated for yellow nutsedge under optimal conditions lack sufficient robustness to be predictive under water stress conditions.

Keywords

yellow nutsedge, C. esculentus L. ♯CYPESTubervegetative reproductiondegree-daysheat unitswater stressCYPES
Type
Weed Biology and Ecology
Information
Weed Science , Volume 44 , Issue 4 , December 1996 , pp. 890 - 896
Copyright
Copyright © 1996 by the Weed Science Society of America 

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