Agronomy Degree Practice Exam

To determine how many times you need to fill a 2-ton fertilizer cart when applying 40 pounds of monoammonium phosphate per acre to a 120-acre field, it's important to start by calculating the total amount of fertilizer needed for the entire field.

First, calculate the total amount of monoammonium phosphate required:

- The application rate is 40 pounds per acre.

- The field size is 120 acres.

Total fertilizer needed = 40 lbs/acre × 120 acres = 4800 lbs.

Next, convert the total requirement into tons since the cart capacity is measured in tons:

- There are 2000 pounds in a ton.

To find out how many tons are needed:

Total fertilizer needed in tons = 4800 lbs ÷ 2000 lbs/ton = 2.4 tons.

Now, since the cart can hold 2 tons, you need to consider how many cart fills are necessary to apply 2.4 tons. Filling the cart once provides 2 tons, and you will need an additional 0.4 tons to reach the total required. However, once the cart is emptied, it cannot be filled to a fraction of its capacity for the second trip.

Therefore, after the first