What is required for hydraulic agitation of the mixture in the aircraft spray tank?

Hydraulic agitation in an aircraft spray tank is essential for ensuring that the mixture of pesticide or fertilizer and carrier is thoroughly blended before application. Having sufficient pump output capacity is critical because the agitation process relies on the ability of the pump to circulate the liquid within the tank effectively. A pump with the right output capacity generates enough pressure and flow to keep the mixture agitated, preventing settling of heavier particles and ensuring a uniform distribution of the active ingredients throughout the tank. This uniformity is vital for achieving consistent application rates and effectiveness of the treatment.

While options such as an external power source, baffles, and proper ventilation may also play roles in the overall functioning of the spray system or in enhancing certain aspects of the tank's operation, they do not directly relate to the hydraulic agitation process itself. The focus on pump output capacity highlights the necessity for a reliable and robust pumping system to achieve adequate agitation, making it the correct answer.