Record Display for the EPA National Library Catalog

RECORD NUMBER: 13 OF 35

OLS Field Name OLS Field Data
Main Title Improving Efficiency in Agricultural Water Use.
Author Kempe, W. D. ;
CORP Author Colorado State Univ., Fort Collins. Natural Resources Center.
Year Published 1970
Report Number Completion-20; DI-14-01-001-713; OWRR-B-008-COLO; 04049,; B-008-COLO(12)
Stock Number PB-197 264
Additional Subjects ( Water supply ; Agricultural economics) ; ( Soils ; Water loss) ; Evaporation ; Salinity ; Osmosis ; Soil water ; Pore pressure ; Abnormalities ; Mulches ; Gravel ; Soil texture ; Motion ; Efficiency ; Saline soils ;
Holdings
Library Call Number Additional Info Location Last
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Status
NTIS  PB-197 264 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 14p
Abstract
Salinity is a factor in most of the western soils. Evaporation of water in the soils leaves the salt concentrated in the remaining solution, building up large concentration gradients even in soils containing relatively low concentrations of total soluble salts. These salt gradients can affect water movement both by acting osmotically and by changing the soil structure and water absorption capabilities. The mechanisms of osmosis were delineated, hydrodynamic dispersion coefficients were determined, and effects of these salt gradients on evaporation were determined. NaCl decreased evaporative CaCl2 tended to increase evaporation. Thin dense crusts of the type formed by raindrop action tended to reduce evaporation when overlying looser soil with larger pores. The mechanisms of osmosis are so involved with ion type, mineral type, structure, and texture that much more work is needed to sort out all the interactions and develop predictive criteria. (Author)