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Temperature and Light Requirements for Wild Radish (Raphanus raphanistrum) Germination over a 12-Month Period following Maturation

Published online by Cambridge University Press:  20 January 2017

Mayank S. Malik*
Affiliation:
Clemson University, Department of Entomology, Soils and Plant Sciences, 277 Poole Agricultural Center, Clemson, SC 29634
Jason K. Norsworthy
Affiliation:
University of Arkansas, Department of Crop, Soil, and Environmental Sciences, 1366 West Altheimer Drive, Fayetteville, AR 72704
Melissa B. Riley
Affiliation:
Clemson University, 114 Long Hall, Clemson, SC 29634
William Bridges Jr.
Affiliation:
Clemson University, Department of Applied Economics and Statistics, 243 Barre Hall, Clemson, SC 29634
*
Corresponding author's E-mail: mmalik@ufl.edu

Abstract

Knowledge of the germination requirements of wild radish will help in determining the favorable conditions for germination and emergence and allow better management of this weed. Experiments were conducted during 2005 to 2006 and 2006 to 2007 to evaluate wild radish temperature and light requirements over a 12-mo period beginning in July on seeds placed on the soil surface and at a 10-cm depth. Germination response was influenced by temperature, light, duration of burial, and burial depth. Freshly harvested seeds (July) had no more than 18% germination whereas seeds allowed to after-ripen in the field for 3 to 6 mo (October to January) had up to 40% germination. The germination of wild radish retrieved from the soil surface was 1.2 to 1.5 times greater at alternating temperatures (2.5/17.5, 7.5/22.5, and 12.5/27.5 C) than at constant temperatures (10, 15, and 20 C) at 0, 3, and 6 mo after maturation. The light requirement for germination varied by time of year with no differences in germination between light and dark conditions for freshly harvested seeds. Far-red light inhibited germination of wild radish, indicating that wild radish may become sensitive to light following an after-ripening period.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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