Variability of crop coefficients in space and time - examples from California
Date
2007-10
Authors
Clark, Byron, author
Soppe, Richard, author
Lal, Deepak, author
Thoreson, Bryan, author
Bastiaanssen, Wim, author
Davids, Grant, author
U.S. Committee on Irrigation and Drainage, publisher
Journal Title
Journal ISSN
Volume Title
Abstract
Crop coefficients are calculated for almonds, citrus, and grapes in California based on a combination of remote sensing of actual crop evapotranspiration from the Surface Energy Balance Algorithm for Land (SEBALĀ®) and ground-based reference evapotranspiration from the California Irrigation Management Information System (CIMIS). Crop coefficients are calculated at the field scale, and the apparent variability in crop coefficients among fields and over time is examined. Crop coefficients derived from remote sensing are compared to published values used with reference evapotranspiration for estimation of crop water use. The opportunity to refine crop coefficients for irrigation management and water resources planning through improved understanding of the variability in crop water use via remotely sensed crop evapotranspiration estimates is discussed.
Description
Presented at the Role of irrigation and drainage in a sustainable future: USCID fourth international conference on irrigation and drainage on October 3-6, 2007 in Sacramento, California.