Buffers or pH modifiers. Above pH 7.0 the pesticide may be subject to degradation by alkaline hydrolysis. Buffers and acidifiers are adjuvants that lower the pH of the water in the spray tank. Buffers tend to stabilize the pH at a relatively constant level. Acidifiers will not necessarily maintain the pH at a constant level.
Drift is a function of droplet size.
Drops with diameters of 100 microns or less tend to drift away from targeted areas. Drift retardants or deposition aids improve on-target placement of the pesticide spray by increasing the average droplet size. Drift reduction could be very important near sensitive sites, and may well be worth the small reductions in efficacy that may result from the change in droplet size. Some pesticide formulations will create foam or a frothy head in some spray tabks. This is often the result of both the type of surfactant used in the formulation and the type of spray tank agitation system.