Record Display for the EPA National Library Catalog


Main Title Management Practices Affecting Quality and Quantity of Irrigation Return Flow.
Author King, Larry G. ; Hanks., R. John ;
CORP Author Utah State Univ., Logan.;Environmental Protection Agency, Washington, D.C. Office of Research and Development.
Year Published 1974
Report Number EPA-S801040; EPA/660/2-75-005;
Stock Number PB-242 827
Additional Subjects Irrigation ; Flow fields ; Water quality ; Management ; Fertilizers ; Water supply ; Drainage ; Soil water ; Tile drains ; Inorganic nitrates ; Mathematical models ; Nitrogen ; Salinity ; Field tests ; Water table ; Utah ; Return flow ; Soil water movement
Library Call Number Additional Info Location Last
NTIS  PB-242 827 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 168p
Field and laboratory research was conducted to determine the effects of irrigation management and fertilizer use upon the quality and quantity of irrigation return flow. The total seasonal discharge of slats from the tile drainage system was directly related to the quantity of water discharged, because the solute concentration of the ground water was essentially constant over time. Under such conditions, reduction of salt content of return flow is accomplished by reduced drain discharge. Irrigation management for salinity control must be practiced on a major part of a particular hydrologic unit so that benefits are not negated by practices in adjoining areas. Field studies and computer models showed that salts may be stored in the zone above the water table over periods of several years without adversely affecting crop yields on soils with high 'buffering' capacity as encountered in this study. However, over the long term, salt balance must be obtained. Appreciable amounts of nitrate moved into drainage water at depths of at least 106 cm from the applications of commercial fertilizer and dairy manure to ground surface. Submergence of tile drains in the field reduced nitrate concentrations in the effluent, especially under heavy manure applications.