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United States Department of Agriculture (USDA) 2020

QUANTIFYING SALINITY CONTROLS AND CROP WATER FOOTPRINT IN IRRIGATED STREAM-AQUIFER SYSTEMS

Salinity Water Crop Irrigation

United States Department of Agriculture (USDA) National Institute of Food and Agriculture

Titre : QUANTIFYING SALINITY CONTROLS AND CROP WATER FOOTPRINT IN IRRIGATED STREAM-AQUIFER SYSTEMS

Identification : 1022683

Pays : Etats Unis

Durée : START : 01 JUL 2020 TERM : 30 JUN 2022

Résumé
Intense agricultural irrigation and associated high water tables in the Lower Arkansas River Valley (LARV) in southeastern Colorado have led to elevated concentrations of salt in the soil and groundwater system due to evaporative concentration, upflux from saline high water tables under fields, and the dissolution of salts and minerals from outcrops, bedrock, and associated soils. High salinity concentrations have in turn caused appreciable reduction in crop yield and the degradation of arable land. This salinization must be controlled, or the land may soon become irreversibly non-productive.This project will use a new salinity watershed modeling tool to answer the following questions:What controls salinity in the LARV ? What are the controlling hydrological, environmental, and management factors on salinity concentration in soils, the aquifer, and in the Arkansas River and its tributaries ?What is the water footprint (i.e. the amount of water used for food production) for each crop type in the LARV ? How does salinity effect the water footprint ?What land and water management strategies could be implemented to control salinity in soils, the aquifer, and the river system ?Expected outputs therefore include a ranking of influential hydrologic, environmental, and management factors on salinity in soils, the aquifer, and the streams in the Arkansas River system ; values of water footprint for each crop type ; and a list of strategies that can be used to curb salinization in the LARV and their quantitative impact on crop yield.

Objectifs
The proposed 2-year project will use the tested watershed model SWAT-Salt (Bailey et al., 2019) to achieve the following three objectives for a regional-scale (750 km2) area of the Lower Arkansas River Valley (LARV), Colorado:determine the controlling hydrological, environmental, and management factors on salinity movement and contamination in the LARV ;estimate the water footprint (i.e. the amount of water used for food production) for each crop type in the LARV ; andidentify best management practices for controlling salinity in the LARV and assess their effect on salinity in soils, the aquifer, and the Arkansas River system.

Performing Institution : COLORADO STATE UNIVERSITY
Investigator : Bailey, RY, .

Présentation : USDA (NIFA)

Page publiée le 28 novembre 2021