What factor causes the flow rate of dry granular pesticide products to vary?

The flow rate of dry granular pesticide products primarily depends on the physical characteristics of the granules themselves and the environmental conditions they are exposed to. Particle size plays a crucial role; smaller particles tend to have a higher surface area relative to their volume, which can lead to increased friction and clumping, potentially slowing down their flow. Conversely, larger particles may flow more freely.

Humidity also impacts flow rate. In humid conditions, granules can absorb moisture from the air, leading to clumping or caking of the product, which can significantly reduce the flow rate. Conversely, in very dry conditions, the granules may flow more easily due to a lack of moisture binding them together.

Together, the interplay of particle size and humidity is critical in determining how easily dry granular pesticides can move through an applicator and onto the target area, making this the correct choice.