Send to

Choose Destination
See comment in PubMed Commons below
J Biol Phys. 2009 Aug;35(3):255-64. doi: 10.1007/s10867-009-9161-0. Epub 2009 Jun 11.

Evaluation of leaf water status by means of permittivity at terahertz frequencies.

Author information

Institut für Hochfrequenztechnik, TU Braunschweig, 38106 Braunschweig, Germany.


We present an electromagnetic model of plant leaves which describes their permittivity at terahertz frequencies. The complex permittivity is investigated as a function of the water content of the leaf. Our measurements on coffee leaves (Coffea arabica L.) demonstrate that the dielectric material parameters can be employed to determine the leaf water status and, therefore, to monitor drought stress in plant leaves. The electromagnetic model consists of an effective medium theory, which is implemented by a third order extension of the Landau, Lifshitz, Looyenga model. The influence of scattering becomes important at higher frequencies and is modeled by a Rayleigh roughness factor.

PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Springer Icon for PubMed Central
    Loading ...
    Support Center