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Soil Light Penetration and Dormancy of Jimsonweed (Datura stramonium) Seeds

Published online by Cambridge University Press:  12 June 2017

Stefano Benvenuti
Stefano Benvenuti*
Affiliation:
Scuola Superiore di Studi Universitari e di Perfezionamento “S. Anna,” Via Carducci 40, 56100 Pisa, Italy
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Abstract

Trials were carried out to determine the degree of light transmittance through soil and its role in photo-induced germination of buried weed seeds. Transmittance was found to be strongly dependent on soil type and decreased with decreasing particle size and with an increase in darker components. In each soil examined, light penetration fell below 0.01% at a depth of no more than 4 mm. It was also noted that with increasing soil depth, light permeability was proportional to wavelength, leading to progressive decline in the red-far red ratio. Low light penetration played a crucial role in germination of jimsonweed seeds, which had became light-sensitive after prolonged burial. Although this effect is a function of soil type, it may represent an important ecological factor influencing seed emergence in the first few mm of upper soil layers.

Keywords

Jimsonweed, Datura stramonium (L.) DATST #3Soil transmittanceplanting depthseed dormancyphytochrome
Type
Weed biology and Ecology
Information
Weed Science , Volume 43 , Issue 3 , September 1995 , pp. 389 - 393
Copyright
Copyright © 1995 by the Weed Science Society of America 

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