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1 May 2003 Influence of environmental factors on after-ripened crowfootgrass (Dactyloctenium aegyptium) seed germination
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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.

Nomenclature: Crowfootgrass, Dactyloctenium aegyptium (L.) Willd. DTTAE.

Ian C. Burke, Walter E. Thomas, Janet F. Spears, and John W. Wilcut "Influence of environmental factors on after-ripened crowfootgrass (Dactyloctenium aegyptium) seed germination," Weed Science 51(3), (1 May 2003). https://doi.org/10.1614/0043-1745(2003)051[0342:IOEFOA]2.0.CO;2
Received: 26 April 2002; Accepted: 21 August 2002; Published: 1 May 2003
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