Which formulation requires no agitation in the spray tank?

• A. SP
• B. WDG
• C. DF
• D. M

Answer: (A)

Formulations behave differently in water depending on how they are built to release the active ingredient. The key idea here is that some products dissolve completely to form a true solution, while others stay as solids or form suspensions that need to be kept mixed.

A soluble powder is designed to dissolve in water to a uniform solution. Once it’s dissolved, there are no solid particles left to settle, so you don’t need agitation to keep the mixture uniform in the tank. That’s why this type can be used without vigorous stirring.

In contrast, water-dispersible granules and dry flowables remain as solids or form suspensions in water. Without agitation, those particles will settle out, clump, or separate, leading to uneven concentration and potential nozzle buildup. Therefore, agitation is important for these formulations to maintain a uniform spray. Microencapsulated or other types often require stirring to ensure even distribution as well.

So, the formulation that requires no agitation is the one that dissolves completely in water to a true solution.