Which equipment is used to apply granular pesticide or fertilizer formulations by dropping them onto a spinning plate?

The rotary spreader is specifically designed to apply granular pesticides or fertilizers efficiently. It utilizes a spinning plate that disperses the material as it is dropped onto the plate, allowing for a wide and even distribution across the treatment area. This mechanism ensures that the product covers a large space uniformly, which is essential for effective application.

In contrast, the hand sprayer and liquid sprayer are primarily used for liquid formulations, making them unsuitable for granular applications. The granular applicator, while related to the application of granular products, does not utilize the spinning plate mechanism that characterizes rotary spreaders. Therefore, the rotary spreader is the correct choice for applying granular formulations through a method that maximizes coverage and efficiency.