Diurnally Alternating Temperatures Stimulate Sprouting of Purple Nutsedge (Cyperus rotundus) Tubers

Experiments were conducted to determine the response of purple nutsedge tuber sprouting to diurnally alternating temperature. These experiments compared the response to alternating and constant temperatures and determined the effect of the amplitude of alternation and time of exposure to the maximum...

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Bibliographic Details
Published in:Weed science 1996-01, Vol.44 (1), p.122-125
Main Authors: Miles, Joel E., Nishimoto, Roy K., Kawabata, Osamu
Format: Article
Language:English
Subjects:
Agrology
Dormancy
Germination
Seeds
Sprouting
Temperature gradients
Tillage
Tuber sprouting
Tubers
Weed Biology and Ecology
Weed control
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Summary:Experiments were conducted to determine the response of purple nutsedge tuber sprouting to diurnally alternating temperature. These experiments compared the response to alternating and constant temperatures and determined the effect of the amplitude of alternation and time of exposure to the maximum temperature. Tuber sprouting was more rapid and complete with alternating temperatures than with constant temperatures. Increasing temperature fluctuation from 0 to 6 C for 12 h daily linearly increased total tuber sprouting. As little as 30 min exposure to high temperature per day provided nearly the same level of sprouting as a 12 h alternating temperature cycle. This phenomenon should be considered when conducting studies to describe tuber temperature responses or when predicting tuber sprouting and emergence.
ISSN:0043-1745
1550-2759
DOI:10.1017/S0043174500093644