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- Title
EFFECT OF MINIMUM SOIL TEMPERATURE ON DIFFERENTIAL DISTRIBUTION OF CYPERUS ROTUNDUS AND C. ESCULENTUS IN THE UNITED STATES.
- Authors
Stoller, E. W.
- Abstract
The response of tubers to low temperatures was investigated to gain insight into a physiological basis for the differential distribution of <em>Cyperus esculentus</em> L. (yellow nutsedge) and <em>C. rotundus</em> L. (purple nutsedge) in the United States. Only <em>C. esculentus</em> tubers survived the winter of 1968-69 in the field at Urbana, Illinois. Less than 10% of <em>C. rotundus</em> tubers survived at 2°C for 12 weeks, whereas more than 95% of <em>C. esculentus</em> tubers survived this treatment. Exposures to -2°C for 4 h or longer killed 50% of <em>C. rotundus</em> tubers, whereas -6.5°C was required to kill 50% of <em>C. esculentus</em> tubers. <em>C. rotundus</em> distribution is restricted to regions where the soil seldom freezes, whereas <em>C. esculentus</em> is distributed in regions where the soil temperatures often get below freezing. Survival of <em>C. esculentus</em> tubers in soil which frequently freezes may account for its wide distribution. Death of <em>C. rotundus</em> tubers in soils which freeze apparently is the reason why the species is restricted to the southeastern and southwestern regions of the U.S.A.
- Subjects
TUBERS; LOW temperatures; CHUFA; CYPERUS; YELLOW nutsedge
- Publication
Weed Research, 1973, Vol 13, Issue 2, p209
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1973.tb01265.x