Droplet size agrochemical sprays

Spray nozzle type plays an important role in the success of agrochemical application. For broadcast applications to soil, flat fan nozzles should be used. Newer spray tips such as the DG TeeJet, XR TeeJet, Turbo TeeJet and similar nozzles supplied by Lechler and Hardy have provided acceptable results in a number of studies. For a given nozzle type, the lower the application pressure, the larger is the spray droplet size and the less potential for spray drift. Similarly, the closer the boom is positioned to the soil surface, the less is the potential for spray drift." Most applications are made with spray tips having 80° or 110° spray angles and boom heights of about 50 cm above the soil surface. 

A formulation technique developed during the 1960s uses low-volume and ultralow-volume sprays, particularly of liquid formulations. These formulations, developed to reduce application costs, contain concentrated agrochemical with little or no solvent or additives. Mechanical equipment is used to form liquid droplets of the active material with fairly uniform size (40-100 microns). There is evidence that such formulations increase the biological effectiveness of insecticides (e.g., malation and naled). The problem is one of... 

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