A soil test recommends 45 pounds K2O per acre for grain sorghum. If muriate of potash (0-0-60) is the chosen fertilizer, how many pounds are needed for an 80-acre field?

To determine how many pounds of muriate of potash (0-0-60) are needed for an 80-acre field based on the recommendation of 45 pounds of K2O per acre, it's important to first calculate the total K2O requirement for the entire field.

Starting with the recommendation, multiplying 45 pounds of K2O by 80 acres gives a total requirement of 3600 pounds of K2O (45 pounds/acre * 80 acres = 3600 pounds K2O).

Muriate of potash contains 60% K2O. To find out how many pounds of muriate of potash are required to meet the 3600 pounds of K2O needed, you need to divide the total K2O requirement by the percentage of K2O in the fertilizer.

This calculation is carried out as follows:

3600 pounds of K2O / 0.60 = 6000 pounds of muriate of potash needed.

Thus, for an 80-acre field, 6000 pounds of muriate of potash is the correct amount to apply in order to meet the recommended amount of K2O for the grain sorghum.