Grade 12 Fertilizer Calculation Worksheet

Grade 12 Fertilizer Calculation Worksheet

Read each question carefully and provide detailed answers. Show all your calculations where applicable.

1. A fertilizer bag is labeled 15-10-20. Explain what each of these numbers represents in terms of plant nutrients.

2. Nitrogen (N) is primarily responsible for   growth, while Phosphorus (P) promotes   and flowering. Potassium (K) helps with overall plant   and disease resistance.

3. You need to apply 2 lbs of actual nitrogen per 1000 sq ft. If you are using a fertilizer with an NPK ratio of 20-5-10, how much of this fertilizer (in lbs) do you need to apply to a 5000 sq ft lawn?

4. Which of the following is the chemical form of phosphorus commonly found in fertilizers?

5. You have two fertilizers: Urea (46-0-0) and Muriate of Potash (0-0-60). If you want to create a blend that provides 10 lbs of nitrogen and 5 lbs of potassium, how much of each fertilizer (in lbs) would you need?

Refer to the image of a fertilizer bag to answer the following question:

6. Based on a typical fertilizer label, what other information, besides the NPK ratio, would you expect to find on this bag that is important for safe and effective use?