Application of agrichemicals by chemigation, pivot-attached sprayer systems, and conventional sprayers

The application method and the volume of water associated with the applicat ion method influences the effectiveness of agrichemicals. We evaluated the effectiveness of chemigation, pivot-attached sprayer systems(PASS), and tra ctor-mounted sprayers for the applications of preemergence and postemergenc e herbicide and fungicide in peanut and for defoliant applications in cotto n. Chemigation and PASS were effective methods for applying agrichemicals w hen high volumes of water are needed to provide penetration into the crop c anopy or to activate preemergence herbicides. PASS applications demonstrate d a potential for the commercial application of some materials that are nor compatible with chemigation systems, such as defoliants, postemergence her bicides, fungicides, and insecticides. Therefore, producers who install PAS S may be able to increase the efficiency and versatility of their irrigatio n systems far applying selected agrichemicals.