What is the role of proper agitation in a spray tank?

• A. Improves the color of spray.
• B. Reduces the need for drift-reducing nozzles.
• C. Increases evaporation rate.
• D. Keeps solid or emulsified formulations evenly suspended to ensure consistent application.

Answer: (D)

Keeping solids or emulsified components suspended in the spray tank is essential for a uniform application. When agitation is properly maintained, every draw from the tank delivers the same concentration of active ingredients, adjuvants, and carriers, so the spray you apply is consistent in rate and effectiveness.

If agitation is inadequate, particles settle to the bottom or emulsions separate, causing the mix to vary throughout the tank. That means some portions deliver too much, others too little, which can lead to insufficient pest control, crop injury from hotspots, clogging of filters or nozzles, and uneven spray patterns. Proper agitation, whether with a mechanical mixer, a jet recirculation system, or another approved method, keeps everything blended as you spray.

Color change, drift-reducing nozzle use, or evaporation are not what agitation primarily controls. Color is cosmetic, drift-reduction relates to droplet size and nozzle design, and evaporation depends on temperature and volatility of the product, not how you mix or keep things stirred in the tank. The key idea is to maintain a consistent suspension so the application is reliable and effective.