Fertilizer Calculation Worksheet
A Grade 10 Science worksheet focusing on calculating fertilizer application rates and nutrient content.
Includes
Standards
Topics
Fertilizer Calculation Worksheet
Name:
Date:
Score:
Read each question carefully and show all your work for calculations. Use the provided image of a fertilizer bag to answer relevant questions.
Refer to the image of the fertilizer bag below for the following questions.
Assume the NPK ratio for this fertilizer is 15-10-5.
1. The three primary macronutrients found in most fertilizers are Nitrogen (N), Phosphorus (P), and (K).
2. An NPK ratio of 15-10-5 means that for every 100 kg of fertilizer, there are 15 kg of Nitrogen, 10 kg of Phosphorus, and 5 kg of .
1. A farmer needs to apply 2 kg of actual Nitrogen per 100 square meters. If they are using the fertilizer shown in the image (15-10-5), how many kg of fertilizer should be applied to 100 square meters?
2. If a garden bed is 50 square meters, and the farmer wants to apply 1 kg of actual Phosphorus, how much of the 15-10-5 fertilizer is needed for this area?
1. What does the 'P' in the NPK ratio represent?
Potassium
Protein
Phosphorus
Potash
2. A fertilizer with an NPK ratio of 10-20-10 is considered high in which nutrient?
Nitrogen
Phosphorus
Potassium
All equally
1. The numbers in an NPK ratio always represent the percentage by weight of Nitrogen, Phosphorus, and Potassium in that order.
True
False
A farmer has a field that is 200 meters long and 100 meters wide. They want to apply a 15-10-5 fertilizer to achieve an application rate of 30 kg of actual Nitrogen per hectare (1 hectare = 10,000 square meters). Calculate the total amount of fertilizer (in kg) the farmer needs to purchase for the entire field.