In the spray rate equation, what does W stand for?

• A. Effective sprayed width per nozzle
• B. Water volume
• C. Pesticide weight
• D. Wind speed

Answer: (A)

In the spray rate equation, you’re converting the liquid flowing from each nozzle into how much land gets treated per unit time. A key factor in that conversion is the width of the spray pattern—the horizontal extent across the field that a single nozzle covers. This width, the effective sprayed width per nozzle, is what W represents. It tells you how wide the spray lands as you move, which is essential for turning nozzle flow (how much liquid is coming out) and speed (how fast you’re moving) into coverage area (land treated per minute or per acre). Water volume is tied to the flow from the nozzle, not the width of the spray pattern, while wind speed affects drift, and pesticide weight relates to concentration, not the pattern width. So W stands for the effective sprayed width per nozzle.