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RECORD NUMBER: 50 OF 323

OLS Field Name OLS Field Data
Main Title Correlations Between Canopy Reflectance and Leaf Temperature in Irrigated and Droughted Soybeans.
Author Cure, W. W. ; Flagler, R. B. ; Heagle., A. S. ;
CORP Author North Carolina State Univ. at Raleigh. ;Texas Agricultural Experiment Station, College Station.;Corvallis Environmental Research Lab., OR.
Publisher c1989
Year Published 1989
Report Number EPA/600/J-89/411;
Stock Number PB90-245846
Additional Subjects Soil moisture ; Soybean plants ; Leaves(Botany) ; Reflectance ; Canopies ; Irrigation ; Atmospheric temperature ; Infrared radiation ; Stress(Physiology) ; Reprints ;
Holdings
Library Call Number Additional Info Location Last
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Status
NTIS  PB90-245846 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 12/03/1990
Collation 10p
Abstract
Effects of water stress on soybeans were characterized over a 4-day period in well-watered (WW) and water-stressed (WS) plots by measurements of leaf temperature, air temperature, and canopy reflectance. The objectives were to assess canopy reflectance as an indicator of drought stress in soybean and to determine if canopy reflectance could be predicted from leaf temperature. Reflectance from the WS plants was greater in the red portion of the visible spectrum and less at near-infrared wavelengths. Correlation coefficients with the reflectance measurements were generally greater with leaf temperature than with either the air temperature within the canopy or the differential between leaf and air temperatures. Coefficients of determination in excess of 0.8 could be obtained for models predicting either red or near-infrared reflectance as a function of leaf temperature by excluding those measurements taken shortly after irrigations. Plant size strongly affected model parameters. (Copyright (c) Elsevier Science Publishing Co., Inc. 1989.)