Modeling contribution of shallow groundwater to evapotranspiration and yield of maize in an arid area.

ABSTRACT: Capillary rise from shallow groundwater can decrease the need for irrigation water. However, simple techniques do not exist to quantify the contribution of capillary flux to crop water use. In this study we develop the Agricultural Water Productivity Model for Shallow Groundwater (AWPM-SG) for calculating capillary fluxes from shallow groundwater using readily available data. The model combines an analytical solution of upward flux from groundwater with the EPIC crop growth model. AWPM-SG was calibrated and validated with 2-year lysimetric experiment with maize. Predicted soil moisture, groundwater depth and leaf area index agreed with the observations. To investigate the response of model, various scenarios were run in which the irrigation amount and groundwater depth were varied. Simulat

SUBMITTER: Gao X 

PROVIDER: S-EPMC5318869 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature