If the recommended spray volume for broadcast spraying is 20 GPA, what volume is actually applied when using a 15-inch band over rows that are 30 inches apart?

• A. 10 GPA
• B. 15 GPA
• C. 20 GPA
• D. 40 GPA

Answer: (A)

To determine the actual volume of spray applied when using a 15-inch band over rows that are 30 inches apart, it is essential to calculate the effective spray coverage. The concept of GPA (gallons per acre) is vital here, as it reflects the amount of water or solution applied over a given area.

When broadcasting, if the recommended spray volume is 20 GPA, it means that this volume is applied uniformly over the entire area. However, when switching to band spraying, the volume applied is concentrated over a narrower portion of the field, specifically the band width. In this case, the band is 15 inches wide, which is narrower than the 30-inch row spacing.

To find the adjusted GPA for the banded application, we need to calculate the ratio of the band width to the row spacing. Since the band is 15 inches and the row spacing is 30 inches, the effective application area is halved. Therefore, the actual gallons per acre applied in this scenario effectively becomes half of the recommended broadcast rate.

By applying that logic, 20 GPA divided by 2 equals 10 GPA. This calculation shows that only 10 gallons per acre are delivered when using the 15-inch banding system over the specified