RT Journal Article SR Electronic T1 Urban Trees and Water: An Overview of Studies on Irrigation Needs in the Western United States and a Discussion Regarding Future Research JF Arboriculture & Urban Forestry (AUF) FD International Society of Arboriculture SP 132 OP 135 DO 10.48044/jauf.2013.018 VO 39 IS 3 A1 Costello, Laurence YR 2013 UL http://auf.isa-arbor.com/content/39/3/132.abstract AB A review of the literature concerning water needs and water loss from landscape plants is presented. Studies conducted in the field, using lysimeters, and in containers are summarized and discussed. In some studies, crop coefficients or water use coefficients are included. A discussion of the variability found in research methods and the need for a standardized protocol for tree water needs studies is presented.