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Influence of environmental factors on after-ripened crowfootgrass (Dactyloctenium aegyptium) seed germination

Published online by Cambridge University Press:  20 January 2017

Ian C. Burke ,
Walter E. Thomas ,
Janet F. Spears  and
John W. Wilcut
Ian C. Burke
Affiliation:
Crop Science Department, Box 7620, North Carolina State University, Raleigh, NC 27695-7620
Walter E. Thomas
Affiliation:
Crop Science Department, Box 7620, North Carolina State University, Raleigh, NC 27695-7620
Janet F. Spears
Affiliation:
Crop Science Department, Box 7620, North Carolina State University, Raleigh, NC 27695-7620
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Abstract

Laboratory and greenhouse studies were conducted to determine the effect of temperature, pH, water stress, and planting depth on crowfootgrass germination. When treated with constant temperature, crowfootgrass germinated over a range of 15 to 40 C, with the optimum germination occurring at 30 C (42%). Onset, rate, and total germination (94%) were greatest in an alternating 20 and 35 C temperature regime. Germination decreased as pH increased, with greatest germination occurring at pH 4 and 5. Germination was reduced when seed was subjected to water stress, and no germination occurred below −0.8 mPa. Emergence was similar when seed were placed on the soil surface or buried at depths of 0.5 or 1 cm. Germination decreased with burial depth, and no seed emerged from 10 cm. These data suggest that crowfootgrass may emerge later in the season with warmer temperatures and after a precipitation event, and may emerge rapidly. These attributes could contribute to poor control later in the season by soil-applied herbicides or allow crowfootgrass to emerge after final postemergence treatments are made.

Keywords

Crowfootgrass, Dactyloctenium aegyptium (L.) Willd. DTTAEAlternating temperaturepHscarificationwater stressweed biology
Type
Research Article
Information
Weed Science , Volume 51 , Issue 3 , June 2003 , pp. 342 - 347
Copyright
Copyright © Weed Science Society of America 

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