Fertilizer Calculation Worksheet
This worksheet covers essential concepts and calculations for fertilizer application, including NPK ratios, nutrient percentages, and determining application rates.
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Fertilizer Calculation Worksheet
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Read each question carefully and provide detailed answers. Show all your work for calculation problems.
1. What do the numbers 10-20-10 on a fertilizer bag represent?
Percentage of Nitrogen, Phosphorus, and Potassium by weight
Ratio of Nitrogen to Phosphorus to Potassium
Grams of Nitrogen, Phosphorus, and Potassium per kilogram of fertilizer
Parts per million of Nitrogen, Phosphorus, and Potassium
2. Which of the following nutrients is primarily responsible for vigorous vegetative growth and green leaf development?
Phosphorus
Potassium
Nitrogen
Calcium
3. The three primary macronutrients required by plants are , , and .
4. Fertilizer analysis is typically expressed as percentages of N, P2O5, and K2O, which represent , , and , respectively.
5. A gardener wants to apply 1 pound of actual Nitrogen per 1,000 sq ft. If they are using a fertilizer with an analysis of 20-5-10, how many pounds of this fertilizer do they need for a 5,000 sq ft lawn?
6. You have a 50 lb bag of 15-0-15 fertilizer. How many pounds of Potassium (K2O) are in the bag?
7. A fertilizer labeled 0-0-60 is a good source of nitrogen.
True
False
8. Examine the fertilizer bag below. If this bag weighs 25 kg, calculate the actual weight of Nitrogen (N), Phosphorus (P2O5), and Potassium (K2O) in grams.
