The most economical time to control invading noxious shrubs is at an early stage in the invasion, when stands are sparse. One method of doing this is with a ground spray rig (Fig. 1). With such a rig the problem is to get the guns out from the vehicle so that a reasonable-sized swath can be covered. The out-rigger apparatus described herein can be used to cover a swath of 50 feet where the brush is fairly dense, to 90 feet on sparser stands.

Preliminary investigations were conducted to determine the feasibility of making band applications of solid materials (dust and granules) into the crop row.

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.