Abstract
The use of water-sensitive cards provides a quick and easy method for sampling the coverage and deposition from spray applications. This measure is typically limited to percentage coverage because measures of droplet size, and thus deposition rate, are highly influenced by the stain diameter that results from the droplet deposition and spread on the card. To determine the diameter of the droplets from the resulting stain, spread factor relations are used. Complicating this process is the fact that the stain diameter, and thus the spread factor, are affected by the physical properties of the spray solution, meaning different spray solutions require unique spread factor relations to accurately estimate the droplet size and deposition on water-sensitive cards. We evaluated several active product tank mixes with a variety of typical adjuvants to determine the unique spread factors for each. Discrete droplets ranging from 200 to 1,000 μm were generated and deposited on water-sensitive cards, after which the resulting stain diameters were compared to the droplet diameters to develop appropriate spread factor relations.
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