Which of the following has the greatest influence on swath pattern uniformity?

Swath pattern uniformity refers to the consistency and evenness of the application of chemicals or fertilizers over a specific area during aerial application. Nozzle placement has a significant influence on this uniformity because it directly affects how the spray is distributed over the target zone. Properly positioned nozzles ensure that the spray is delivered at the correct angle and trajectory, which helps in creating a consistent coverage across the swath.

When nozzles are placed correctly, they minimize gaps and overlaps in the applied material, thereby optimizing the application's effectiveness and reducing wastage. This careful alignment plays a crucial role in ensuring that each part of the field receives an even application, which is critical for crop health and yield.

Other factors, while important, do not have the same direct impact on the evenness of the application pattern as nozzle placement does. Altitude adjustments can influence droplet size and drift but are secondary to the central role that nozzle placement plays in defining the spray pattern. Weather conditions can affect drift and evaporation but cannot compensate for a poorly designed nozzle configuration. Speed of the aircraft is relevant in determining application rate and droplet size but does not inherently ensure uniform coverage if the nozzle placement is not optimal.