What is the application rate in gallons per acre (GPA) if 287 ml of water is collected in 15 seconds from a nozzle with a spacing of 20 inches?

To find the application rate in gallons per acre, the first step is to convert the volume of water collected into a more usable format for calculating application rates.

First, convert milliliters to gallons. There are approximately 3,785.41 milliliters in a gallon. Therefore, 287 ml is equivalent to:

[

287 \text{ ml} \div 3785.41 \text{ ml/gallon} \approx 0.0758 \text{ gallons}

]

Next, since the water was collected over 15 seconds, we need to calculate the rate per hour. There are 3600 seconds in an hour, so:

[

\text{Rate per hour} = 0.0758 \text{ gallons} \times \left(\frac{3600 \text{ seconds}}{15 \text{ seconds}}\right) \approx 18.3 \text{ gallons per hour}

]

Now that we have the application rate in gallons per hour, we need to convert that to gallons per acre. The spacing of the nozzles is 20 inches, which converts to acres as follows:

1 acre = 43,560 square feet

20 inches = (