AE446, a 5-page illustrated fact sheet by Michael D. Dukes, Mary L. Shedd, and Stacia L. Davis, is part of a series on smart irrigation controllers. It presents the operational techniques of several commercially available evapotranspiration (ET) controllers that are being studied at the University of Florida. Includes references. Published by the UF Department of Agricultural and Biological Engineering, February 2009.
http://edis.ifas.ufl.edu/AE446