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Diurnal movements of cotton leaves expressed as thermodynamic work and entropy changesIt is pointed out that some important agricultural crops show heliotropic leaf movements. In these species, the proclivity of leaves to orient either perpendicularly or parallel or in some combination of these positions with respect to the sun is controlled by the leaf turgor and the availability of water. Such an orientational response is particularly noticeable for cotton. Schutt et al. (1985) have detailed leaf trajectories using three angles. The present investigation applies the three-angle representation to leaf trajectory mapping and to the calculation of the phase angle 'gamma' between the individual leaf normals and the solar direction. Using gamma, the thermodynamic work and entropy functions are evaluated and used to distinguish between the behavior of water-stressed and well watered cotton canopies.
Document ID
19850056122
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Schutt, J. B.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kimes, D. S.
(NASA Goddard Space Flight Center Earth Resources Branch, Greenbelt, MD, United States)
Newcomb, W. W.
(RMS Technologies, Inc. Landover, MD, United States)
Date Acquired
August 12, 2013
Publication Date
June 1, 1985
Publication Information
Publication: Photogrammetric Engineering and Remote Sensing
Volume: 51
ISSN: 0099-1112
Subject Category
Earth Resources And Remote Sensing
Accession Number
85A38273
Distribution Limits
Public
Copyright
Other

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