Record Display for the EPA National Library Catalog

RECORD NUMBER: 31 OF 362

OLS Field Name OLS Field Data
Main Title Evaluation of a System for the Imposition of Plant Water Stress.
Author Snow, M. D. ; Tingey, D. T. ;
CORP Author Corvallis Environmental Research Lab., OR. ;Portland Univ., OR. Dept. of Physical and Life Sciences.
Year Published 1985
Report Number EPA/600/J-85/216;
Stock Number PB86-121530
Additional Subjects Stress(Physiology) ; Plants(Physiology) ; Soil water ; Experimental data ; Evaluation ; Hydraulic conductivity ; Growth ; Transpiration ; Periodic variations ; Reprints ; Sunflowers ; Water levels
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB86-121530 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 8p
Abstract
A system which imposes a range of water stress levels was developed and evaluated. Water stress was controlled by employing a screen to suspend roots above a water column of known height. Levels of water stress were imposed by changing water column height and/or hydraulic conductivity of the medium in the column. The system was evaluated in a series of growth chamber experiments in which sunflowers(Helianthus annuus) were given three levels of water availability for a period of 3 weeks. Third leaf midday water potentials at the end of the trials ranged from -0.73+ or -0.04 to -2.35+ or -0.17 megapascals in water stressed plants compared to -0.04+ or - 0.02 megapascals for control plants. Repetition of experiments showed no statistical differences in leaf water potentials, plant leaf areas, or plastochron indices between trials.