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A Method to Determine Spray Drift Potential from Nozzles and its Link to Buffer Zone Restrictions
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Paper number 011047, 2001 ASAE Annual Meeting. (doi: 10.13031/2013.7333) @2001
Authors: Andreas Herbst
Keywords: Spray drift, drift potential, nozzle, wind tunnel, buffer zone
German Federal Biological Research Centre for Agriculture and Forestry
Braunschweig (BBA) established a system to adjust buffer zone restrictions according to
application conditions. Part of this system is the official list of loss reducing equipment, where
spraying systems are categorized in classes of at least 50%, 75% and 90% spray drift
reduction. This is normally proved by field tests. A method is presented that enables an
evaluation of agricultural atomizers concerning spray drift potential. Single nozzles are tested in
a wind tunnel. A Drift Potential Index (DIX) is calculated from parameters of vertical drift
concentration in a section 2 m downwind from the nozzle. The DIX value is used to classify
sprayers equipped with that nozzle regarding spray drift potential in relation to a conventional
flat fan reference nozzle 03 at 3 bar spray pressure. This reference corresponds to the basic
drift values from field drift measurements.