Record Display for the EPA National Library Catalog


Main Title Semipermeable Membrane System for Subjecting Plants to Water Stress.
Author Tingey, David T. ; Stockwell, Cynthia ;
CORP Author Corvallis Environmental Research Lab., OR.
Year Published 1977
Report Number EPA/600/J-77/134;
Stock Number PB-287 632
Additional Subjects Plants(Botany) ; Membranes ; Plant physiology ; Bean plants ; Hydroponics ; Evaluation ; Plant growth ; Polyoxyethylene ; Vermiculite ; Tables(Data) ; Experimental data ; Phaseolus vulgaris ; Reprints
Library Call Number Additional Info Location Last
NTIS  PB-287 632 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 5p
A system was evaluated for growing plants at reproducible levels of water stress. Beans (Phaseolus vulgaris L.) were grown in vermiculite, transferred to a semipermeable membrane system that encased the root vermiculate mass, and then placed into nutrient solutions to which various amounts of polyethylene glycol (PEG) 20M were added to control solution water potential. The membrane (Spectrapor 1) had a minimum molecular weight cutoff that excluded the PEG 20M. The plants equilibrated with the nutrient solution within 1 to 4 days, and exhibited normal diurnal water relations. Use of the semipermeable membrane system to induce water stress reduces many of the problems associated with hydroponic media.