How is GPA calculated using sprayer output?

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Prepare for the Kansas Commercial Pesticide Applicator Test. Use our flashcards and multiple choice questions, each featuring hints and explanations, to ensure you're ready for the exam!

Multiple Choice

How is GPA calculated using sprayer output?

Explanation:
The main idea is to convert the spray flow into gallons per acre by looking at how much area you cover each minute. GPA is how many gallons you would apply to one acre if you kept the current spray rate. In one minute, you cover an area whose width is the swath width and whose length is how far you travel in that minute. Convert swath width from inches to feet (divide by 12) and convert speed from mph to feet per minute (speed mph × 5280 ÷ 60). Multiply these to get the area sprayed per minute in square feet, then divide by 43,560 to turn that into acres per minute. GPA is then the spray rate in gallons per minute divided by acres per minute. When you work through the unit conversions, you get the familiar form GPA = (GPM × 5940) / (swath width in inches × speed mph). So, increasing GPM raises GPA; increasing swath width or increasing speed lowers GPA since you cover more acres per minute with the same spray flow.

The main idea is to convert the spray flow into gallons per acre by looking at how much area you cover each minute. GPA is how many gallons you would apply to one acre if you kept the current spray rate.

In one minute, you cover an area whose width is the swath width and whose length is how far you travel in that minute. Convert swath width from inches to feet (divide by 12) and convert speed from mph to feet per minute (speed mph × 5280 ÷ 60). Multiply these to get the area sprayed per minute in square feet, then divide by 43,560 to turn that into acres per minute.

GPA is then the spray rate in gallons per minute divided by acres per minute. When you work through the unit conversions, you get the familiar form GPA = (GPM × 5940) / (swath width in inches × speed mph).

So, increasing GPM raises GPA; increasing swath width or increasing speed lowers GPA since you cover more acres per minute with the same spray flow.

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