FREE CFA Label Interpretation and Calculations Questions and Answers

Question 1

An applicator has a 50-pound bag of granular fertilizer with a guaranteed analysis of 24-6-12. How many pounds of actual nitrogen (N), phosphate (P2O5), and potash (K2O) are in the bag?

Accepted Answer

12.0 lbs N, 3.0 lbs P2O5, 6.0 lbs K2O

Answer

9.0 lbs N, 4.5 lbs P2O5, 7.5 lbs K2O

Answer

24.0 lbs N, 6.0 lbs P2O5, 12.0 lbs K2O

Answer

50.0 lbs N, 6.0 lbs P2O5, 12.0 lbs K2O

Question 2

A soil test recommends applying 90 lbs of phosphate (P2O5) per acre. The applicator will use diammonium phosphate (DAP), which has a fertilizer grade of 18-46-0. How many pounds of DAP are needed to apply to one acre to meet the recommendation?

Accepted Answer

195.7 lbs

Answer

41.4 lbs

Answer

90.0 lbs

Answer

500.0 lbs

Question 3

An applicator is using a liquid fertilizer, 32-0-0 Urea Ammonium Nitrate (UAN), which has a density of 11.06 lbs per gallon. How many pounds of actual nitrogen are in a 30-gallon tank of this product?

Accepted Answer

105.8 lbs

Answer

9.6 lbs

Answer

96.0 lbs

Answer

331.8 lbs

Question 4

The guaranteed analysis on a fertilizer label (e.g., 10-20-10) legally represents the minimum percentage by weight of which three nutrients in order?

Accepted Answer

Total Nitrogen (N), Available Phosphate (P2O5), Soluble Potash (K2O)

Answer

Elemental Nitrogen (N), Elemental Phosphorus (P), Elemental Potassium (K)

Answer

Ammoniacal Nitrogen (N), Soluble Phosphorus (P), Liquid Potash (K)

Answer

Organic Nitrogen (N), Bone Phosphate (P2O5), Muriate of Potash (K2O)

Question 5

A turf manager needs to apply 0.9 lbs of actual Nitrogen per 1,000 sq. ft. They are using a fertilizer with an analysis of 21-0-7. How many pounds of this fertilizer product must be applied to a 6,000 sq. ft. lawn area?

Accepted Answer

25.7 lbs

Answer

4.3 lbs

Answer

12.6 lbs

Answer

37.8 lbs

Question 6

Which of the following pieces of information, sometimes found on a fertilizer label, indicates the amount of limestone required to neutralize the long-term acidifying effect of one ton of the fertilizer?

Accepted Answer

Potential Acidity

Answer

Salt Index

Answer

Bulk Density

Answer

Derived From Statement

An applicator has a 50-pound bag of granular fertilizer with a guaranteed analysis of 24-6-12.How many pounds of actual nitrogen (N), phosphate (P2O5), and potash (K2O) are in the bag?

An applicator has a 50-pound bag of granular fertilizer with a guaranteed analysis of 24-6-12.
How many pounds of actual nitrogen (N), phosphate (P2O5), and potash (K2O) are in the bag?