What is the herbicide withdrawal rate in gpm if the original rate is 2.9 oz per minute?

To determine the herbicide withdrawal rate in gallons per minute (gpm) from ounces per minute (oz/min), it is crucial to utilize the conversion factor between these two units. There are 128 ounces in a gallon. To convert 2.9 oz per minute to gpm, the calculation involves dividing the ounces by the number of ounces in a gallon.

Starting with the given rate:

[

2.9 , \text{oz/min} \div 128 , \text{oz/gallon} = \frac{2.9}{128} \approx 0.02266 , \text{gpm}

]

Rounding this value to three decimal places gives approximately 0.023 gpm. This calculated amount aligns with the first option, reinforcing its correctness.

Hence, the herbicide withdrawal rate of 0.023 gpm accurately reflects the conversion from ounces per minute based on the appropriate unit conversion process. Understanding this conversion is crucial for effective pesticide application and management within aquatic environments.