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Influence of environmental factors on slender amaranth (Amaranthus viridis) germination

Published online by Cambridge University Press:  20 January 2017

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

Germination response of slender amaranth to temperature, solution pH, moisture stress, and depth of emergence was evaluated under controlled environmental conditions. Results indicated that 30 C was the optimum constant temperature for germination. Germination of slender amaranth seed at 21 d was similar, with 35/25, 35/20, 30/25, and 30/20 alternating temperature regimes. As temperatures in alternating regimes increased, time to onset of germination decreased and rate of germination increased. Slender amaranth germination was greater with acidic than with basic pH conditions. Germination declined with increasing water stress and was completely inhibited at water potentials below −0.6 MPa. Slender amaranth emergence was greatest at depths of 0.5 to 2 cm, but some seeds emerged from as deep as 6 cm. Information gained in this study will contribute to an integrated control program for slender amaranth.

Keywords

Slender amaranth, Amaranthus viridis L. AMAVILighttemperaturesolution pHmoisture stressburial depthweed biology
Type
Weed Biology and Ecology
Information
Weed Science , Volume 54 , Issue 2 , April 2006 , pp. 316 - 320
Copyright
Copyright © Weed Science Society of America 

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