Portability is a very important feature of a sprayer for experimental plots on rangeland. The rockiness of many sites and the height and density of many weed stands, such as species of Artemesia, Chrysothamnus, Linaria, Alhagi, and Centaurea, preclude use of push-type sprayers mounted on wheels. Ries and Terry discuss the use of a portable small-plot sprayer but the capacity of their sprayer is not adequate for many situations. Range weed control research is often combined with reseeding and fertilization studies, and a sprayer with considerable capacity is needed for large plots. Swath widths of at least 10 feet are desirable.