CFA Label Interpretation and Calculations 3

Question 1

A liquid fertilizer label states the concentration is 4-0-8 at a dilution rate of 2 oz per gallon. An applicator mixes 6 gallons. How many oz of concentrate are used?

Accepted Answer

12 oz

Answer

2 oz per gallon × 6 gallons = 12 oz of concentrate.

Question 2

A fertilizer is labeled 30-0-4 with a recommended rate of 1 lb nitrogen per 1,000 sq ft. How many lbs of product per 1,000 sq ft are needed?

Accepted Answer

3.33 lbs

Answer

To deliver 1 lb N from a 30% N product: 1 ÷ 0.30 = 3.33 lbs of product per 1,000 sq ft.

Question 3

Which label element tells the applicator the maximum number of applications allowed per year?

Accepted Answer

Directions for use

Answer

Application frequency limits and annual maximums are found in the Directions for Use section of the label.

Question 4

A blended fertilizer label shows 16-4-8 plus 1% iron. How many lbs of iron are in a 40 lb bag?

Accepted Answer

0.4 lbs

Answer

40 lbs × 1% = 40 × 0.01 = 0.4 lbs of iron.

Question 5

When calculating fertilizer application rates, why must applicators distinguish between 'product rate' and 'nutrient rate'?

Accepted Answer

Applying product rate as nutrient rate can over- or under-apply nutrients

Answer

Confusing product rate with nutrient rate leads to incorrect application because the actual nutrient concentration varies by product.

CFA Practice Test

CFA Practice Test

CFA Label Interpretation and Calculations 3